Gertrude McGettigan, individually and as mother and next friend of Charles S. McGettigan, a minor, sued the National Bank of Washington, a corporation, individually and as trustee, and Fred A. Smith & Company, a corporation, for damages alleged to have been suffered by the minor in circumstances to be explained insofar as this can be done on the present record. Following rather full pretrial proceedings, including the taking of depositions, and upon the basis also of allegations in the pleadings, the District Court granted the motion of defendants for summary judgment. Plaintiffs’ motion for reconsideration was denied. This appeal was then taken by plaintiffs.
Although there may not now appear to be any “genuine issue as to any material fact,” we think defendants were not “entitled to a judgment as a matter of law” and therefore not entitled to summary judgment. Fed.R.Civ.P. 56(c). The pleadings, depositions and other eviden-tiary matters before the court were sufficient if followed by proof at trial to permit a jurjr to find the facts now to be outlined. The defendant corporations were responsible, as owner and agent, respectively, for the care of a building near the heart of Washington known as 2413 Pennsylvania Avenue, N. W., held in the name of the bank defendant as trustee. In the rear of the main building was a small structure where the occurrences leading to this case arose. Although some years ago this structure was in good condition it had seriously deteriorated. Doors had disappeared. Windows were out and the glass broken. The structure was open to the elements, and was a hangout for persons of questionable occupations and habits. The interior was cluttered with debris and the roof was insecure. The structure was used at times as a sort of club house for young thieves, who engaged in the practice of stealing flares from various sources, including railroad ears and telephone trucks, and using them for their amusement near the premises. The place was the subject of complaints by neighbors. Beginning in 1955 an employee of the defendant agent made a weekly inspection, which disclosed accumulations of debris. A policeman on several occasions advised the agent of the decrepit condition of the premises, the accumulation of junk, and the presence of vagrants. Although the agent, Smith & Company, agreed to correct the situation, nothing was done prior to the accident soon to be described.1 No effort was made to close the structure, remove the debris, or restrict its use by children, delinquents and vagrants.
On March 3, 1956, John, eleven years of age and brother of the minor plaintiff, was playing in the structure. He obtained from the trash and junk there a cylindrical, tubular object, which he took to his home nearby, unaware of what it was. And the boy had seen it several times before during the months he played in the structure. His mother either found the object lying in the kitchen or was given it by another son and placed it in a paper bag outside the back door where there was a small porch. The following day, March 4, the minor plaintiff, then nine years of age, was seen by his mother playing with the object, *705which he had broken in two. Material that looked like sand had come out of it. His mother told the boy to sweep this up. Some minutes later there was an explosion which severely burned the boy. It appears the substance was powder and that the boy applied a lighted match to waxed paper on which he had swept the powder.
It is not alleged that the defendants brought the flare to the premises or knew it was there.
We think the plaintiffs set forth facts which, if proved, would permit a jury to find that defendant landowner and his agent were negligent. This being so, and substantial damages having been alleged as stemming from that negligence, the case should have been submitted to the jury.
Negligence is “conduct * * which falls below the standard established by law for the protection of others against unreasonable risk of harm.” Restatement, Torts § 282 (1934); 2 Harper & James on Torts 896 (1956). And the standard of conduct to be applied is that of the reasonable man in like circumstances. See Prosser on Torts 124 (1955). Whether a defendant has acted as a reasonable man in the circumstances is said to depend upon whether his conduct — act or omissions — created an unreasonable risk of harm toward a plaintiff. This principle is sometimes stated in terms of duty, viz., whether the defendant had a duty to use care toward plaintiff, and if so whether it was breached by the conduct complained of. See Winfield, “Duty in Tortious Negligence,” 34 Columbia L.Rev. 41 (1934). The ulti-t mate question is whether defendant cant fairly be said to be responsible for the | injuries complained of.2 If reasonable men could not differ in answering that question the court, it is said, should not allow the jury to speculate about it; but if reasonable men could differ and draw different inferences from the facts or find one set of facts when two are offered and from those found could conclude that defendant’s conduct was negligent, then the jury ought to be permitted to answer the ultimate question. Grand Trunk R. Co. of Canada v. Ives, 144 U.S. 408, 12 S.Ct. 679, 36 L.Ed. 485 (1892).
Defendants are in the position of an owner or occupier of land, for whom the common law created something of a special status. He was not liable at common law for injuries to a person coming on his land unless such person was an invitee, guest or licensee. If he were a trespasser he could not hold the landowner or occupier liable for his injuries. See Green, “Landowner v. Intruder; Intruder v. Landowner. Basis of Responsibility in Tort,” 21 Mich.L.Rev. 495 (1923). But the law has not remained static in this area. Just as it has advanced in recognition of the need for greater protection to both persons and property from the affirmative acts of another, making negligence the central basis for civil liability,3 it also has tended to bring the landowner p’rlpccupier within similar rules, leaving his status less privileged than it was previously, This has been '.esneciallv "evident in the case of children of tender ..years. ...........
This brings us to the case of Sioux City & Pacific R. Co. v. Stout, 84 U.S. (17 Wallace) 657, 21 L.Ed. 745 (1873). A six year old child was playing on an unguarded, unlocked railroad turntable which when set in motion caught and crushed his foot. The Court, seemingly treating the child’s presence and that of other children on defendant’s land in the past as but one of the circumstances in which it was to be decided whether the landowner’s conduct was proper, said:
*706“[I]f from the evidence given it might justly be inferred by the jury . that the defendant, in the construction, location, management, or condition of its machine had omitted that care and attention to prevent the occurrence of accidents which prudent and careful men ordinarily bestow, the jury was at liberty to find for the plaintiff.”
84 U.S. at 661, 21 L.Ed. 745. From this beginning the courts have fashioned a concept called attractive nuisance, under which the status of an intruding child is like that of an invitee rather than a trespasser. In other words the principles of negligence become relevant notwithstanding the child came upon the owner’s land without permission. But there was under the earlier approach of the doctrine the requirement of an allurement as well as the tests of negligence. This ceased to be a serious obstacle to recovery, however, when courts began to abandon the fiction of an invitation by allurement and recognized — as the Restatement has— another basis for the result reached in such cases as Stout, namely, the value of the lives of children to society. See, e. g., Wolfe v. Rehbein, 123 Conn. 110, 193 A. 608 (1937); Drew v. Lett, 95 Ind.App. 89, 182 N.E. 547 (1932). And compare Best v. District of Columbia, 291 U.S. 411, 54 S.Ct. 487, 78 L.Ed. 540 (1934), Sioux City & Pacific R. Co. v. Stout, supra, and Eastburn v. Levin, 72 App.D.C. 190, 113 F.2d 176 (1940), with United Zinc & Chemical Co. v. Britt, 258 U.S. 268, 42 S.Ct. 299, 66 L.Ed. 615 (1922), and Branan v. Wimsatt, 54 App.D.C. 374, 298 F. 833 (1924).
In Best v. District of Columbia, supra, the dangerous condition which caused the child’s death was a hole in the defendant’s wharf and not the piles of sand upon which children had previously played. And in Eastburn v. Levin, supra, this court said:
“The underlying question is whether it is better to let occupants arrange their premises in total disregard of neighboring children, or to require them to take such precautions as a normal person would when their premises are attractive and insidiously dangerous to children too young to look out for themselves and when the intrusion of such children is likely. On the one side is the occupant’s interest, and the general interest, in the profitable use of land. On the other is the child’s interest, and the interest of his parents and of society, in life and limb and in compensation for their injury.”
72 App.D.C. at 192, 113 F.2d at 178. The emphasis here is upon a balancing of several interests in the light of conduct that threatens harm, judged by the standard of the reasonable man. And see Branan v. Wimsatt, supra.
In the present case defendants contend that since the dangerous instrumentality was not used by them or brought by them onto their premises the plaintiffs could not recover. This contention fails to take account of the scope both of the law of negligence and the full development of the attractive nuisance doctrine, that is, the rule of liability of a landowner for negligence with respect to children of tender years.4 Courts have extended to such children the protection of the law to include injuries occurring off the defendant’s premises. Thus where a child found dynamite caps and took them home where his brother, also a child, played with them and was injured by the resulting explosion, the injured child was allowed to recover. Dezendorf Marble Co. v. Gartman, 333 S.W.2d 404 (Tex.Civ.App.1960). See also Vills v. City of *707Cloquet, 119 Minn. 277, 138 N.W. 33 (1912); Kingsland v. Erie County Agricultural Soc’y, 298 N.Y. 409, 84 N.E.2d 38 (1949); Lone Star Gas Co. v. Parsons, 159 Okl. 52, 14 P.2d 369 (1932). It is said that the defendant’s conduct in maintaining the condition carries an unreasonable risk of harm to such children when the presence of children on the premises is expected. See Prosser, “Trespassing Children,” 47 Calif.L.Rev. 427, 448-50 (1959).
Nor is the doctrine inapplicable because the dangerous condition is not created by the landowner or possessor. If third persons, even trespassers un-1 known to the landowner or occupier, come; onto the land and create the artificial condition or deposit the harmful object, and the owner does nothing to remedy the condition after a reasonable opportunity to do so, he may be responsible. Roman v. City of Leavenworth, 90 Kan. 379, 133 P. 551 (1913); Simmel v. New Jersey Coop. Co., 47 N.J.Super. 509, 136 A.2d 301 (App.Div.1957), rev’d on other grounds, 28 N.J. 1, 143 A.2d 521 (1958); Johnson v. Sculley Constr. Co., 255 Minn. 41, 95 N.W.2d 409 (1959). But see Gallagher v. Frederick, 366 Pa. 450, 77 A.2d 427 (1951).
In the language of the Restatement, Torts § 339(b), “the condition [must be] one of which the possessor knows or should know * * One authority suggests that the alternative “should know” does not reflect the law.5 This view\fails-to..appreciate the development reflected in the Restatement as well as in some of the decided cases, see n. 5, supra, and text p. 706, supra, which shifts liability to children to a straightforward negligence basis. The effect of 'the pfogfessive application of the attractive nuisance doctrine has been, we think, to erase the line separating landowners and occupiers from other persons generally, when their acts or omissions create an unreasonable risk of harm to children of tender years. James, “Tort Liability of Occupiers of Land: Duties Owed to Trespassers,” 63 Yale L.J. 144, 164 (1953). See, e. g., Wolfe v. Rehbein, supra, where it is said:
“If the presence of children is to be anticipated, the care to be exercised is such as is reasonable having in view the probability that children, because of their youth, will not discover the condition or realize the risk involved in interméddling in it or on coming within the area made dangerous by it. * * * ”
123 Conn. at 116, 193 A. at 610-611.
Applying these principles to the facts which might be proved in the instant case, which we repeat in summary form, we find a rundown building in or near the heart of a large city. Doors had disappeared from the structure, and the interior had become cluttered with debris of various kinds. Persons of questionable habits used the place as a hangout. Neighbors complained of the building’s condition. Policemen advised the owner’s agent on more than one occasion of the building’s rundown condition and of the periodic presence of vagrants. Furthermore, a general provision of the D.C. Code was in effect at the time which placed upon landowners the specific responsibility to see to it that their land was kept free of dangerous debris.6 *708Children had played on the premises previously. The plaintiff’s brother had himself played there before the occasion in question when he pulled out of the debris the object which when exposed to the minor plaintiff and his childish curiosity about its contents caused his injuries. Finally it is not contended that defendants had attempted either to remove the trash or to board up the premises._Upon proof of these circumstances we think, the question of defendants’. negligence Should be submitted to the jury.
This is not a case of a vacant lot in the suburbs where a trespasser but the day before has set a trap, nor a case of a boarded warehouse in the city where others have broken in and stored their loot. Rather our case appears at present to be one of a landowner who has allowed flammable flares to be deposited— undetected and unremoved — for such a period of time as to warrant submitting to the jury the question whether in all the circumstances of the case this was negligent. There is not only the continued presence of the flare, the harmful nature of which could not readily be appreciated by young children, but the accumulation of junk which — defendants failed to remove and of which the flare 'turned out to be a part. The data before the trial court created an issue as to an unreasonable risk of harm towards the minor plaintiff, a child of the neighbor-1 hood, whose injury a jury might reasonably conclude might have been prevented by due care on the part of defendants. The jury should be allowed to decide whether due care was in fact exercised, because reasonable men might differ as to what was required of defendants in the factual situation the jury could have found to exist. See Grand Trunk R. Co. of Canada v. Ives, supra at p. 705.
Two matters remain for additional comment. First, we are referred to the 'Concept of foreseeability represented by the case of Palsgraf v. Long Island R. Co., 248 N.Y. 339, 162 N.E. 99, 59 A.L.R. 1253 (1928), Wherein liability was denied when the court found that a push of a passenger carrying concealed fireworks was not a wrong with respect to the plaintiff standing some distance down ^the platform. The court did pot say that no risk of harm was created by the act of the defendant’s agent. Rather it found that the ambit of the risk did not include the plaintiff injured by falling scales after the explosion caused by the dropping of the fireworks by the passenger who was pushed. The circumstances of the instant case are^dlfferint_in sig-nTflcanFrespects, for here a general con-ditioiTprivailed which put the landowner on notice,, or so the jury coúid Tihd, fhár~his land was being abused or-onis-tfsecCl Furthermore the presence of children who could not be expected to *709appreciate and therefore avoid the risk created by the flare is a factor here of utmost significance.
Finally, whether the negligence which we think can be made out on the facts here alleged will render the appellees responsible in damages is a question of proximate cause.7 We are told that the minor plaintiff’s mother had an opportunity to see the flare and left it in reach of the child injured by it. We agree that the record supports such a view of the facts. But we are not prepared to say that the defendants’ negligence, if any, was not a proximate cause of the injury, bearing in mind that in the case of minors the negligence of a parent may not normally be' imputed to the minor.8 See 2 Harper & James, supra, at 1270-71; and cases collected in 15 A.L.R. 414 (1921). And, generally on the question of proximate cause, see Hanna v. Fletcher, 97 U.S.App.D.C. 310, 231 F.2d 469 (1956), and Dezendorf Marble Co. v. Gartman, supra; Vills v. City of Cloquet, supra; Kingsland v. Erie County Agricultural Soc’y, supra. Furthermore, and we do not pass upon this aspect of the case since in a trial it may be permitted to go to the jury, even if two or more acts of negligence concur to produce a single injury, one tortfeasor is not relieved of liability merely because his negligence was earlier in time. It may still be a proximate cause of the injury. See Prosser on Torts §§ 45 & 46 (1955); 2 Harper & James, supra, § 20.3; Restatement, Torts § 452 (1934).
The granting of appellees’ motion for summary judgment was erroneous and the order appealed from is accordingly reversed.
Reversed.
Before Bazelon, Chief Judge, and Wilbur K. Miller, Fahy, Washington, Danaher, Bastían, Burger, Wright and McGowan, Circuit Judges, in Chambers.
. We do not hold that these conditions existed. The pleadings and depositions indicated plaintiffs could introduce evidence that they did exist.
. “On the whole the rules of accident law are so formulated as to give the jury considerable scope in deciding what the parties should have done, in each specific case, as well as what they did do.” 2 Harper & James at 881.
. See, e. g., Brown v. Kendall, 6 Cush. (60 Mass.) 292 (1850) ; 8 Holdsworth, History of English Law, 446-59 (1937).
. Even 90 years after the Stout decision an adult on the land of another confronted by the same conditions would most likely be held to have assumed the risk or been contributorily negligent or to have no valid claim under the older traditional concepts of duty according to category — trespasser, licensee, invitee. See Green, “Landowners’ Responsibility to Children,” 27 Texas L.Rev. 1, 13, note 39 (1948), for a brief discussion of the adult’s status and collection of some of the cases. But there is the suggestion here that a slight trend away from such result in eases of trespassing adults may be in the making.
. Notwithstanding the wishful thinking of distinguished legal writers, no case has ever held that the possessor is required to inspect his land, or to police it, to discover whether there is any condition upon it which will be likely to harm trespassing children. * * * [Oln the contrary, the decisions are all to the effect that unless he knows of the condition there is no liability.
Prosser, supra, 47 Calif.L.Rev. at 451. To the contrary, see Coeur d’Alene Lumber Co. v. Thompson, 215 F. 8 (9th Cir., 1914); Dehn v. S. Brand Coal & Oil Co., 241 Minn. 237, 63 N.W.2d 6 (1954); Smith v. Otto Hendrickson Post 212, American Legion, 241 Minn. 46, 62 N.W. 2d 354 (1954); Johnson v. Sculley Construction Co., supra.
. 5 D.C.Code § 504 provides as follows:
“The existence on any lot or parcel of land, in the District of Columbia, of * * * miscellaneous materials or *708debris of any kind, including substances that have accumulated as the result of repairs to yards or any building operations, insofar as they affect the public health, comfort, safety, and, welfare is hereby declared a nuisance dangerous to life and limb, and any person, corporation, partnership, syndicate, or company, owning a lot or parcel of land in said District on which such a nuisance exists who shall neglect or refuse to abate the same to the satisfaction of the commissioners of the District of Columbia, after five days’ notice from them to do so, shall, on conviction in the Municipal Court * * * be punished by a fine of not exceeding $50 for each and every day said person, corporation, partnership, or syndicate, fails to comply with such notice. * * * ” [Emphasis supplied.] And this court has decided:
“Where the acts which create a public nuisance cause also private and special injury to an individual, an action at law will die. [Citing, inter alia, Aldrich v. Wetmore, 52 Minn. 164, 53 N.W. 1072 (1893).]”
District of Columbia v. Totten, 55 App.D.C. 312, 318, 5 F.2d 374, 380 (1925). See also Thayer, “Public Wrong and Private Action,” 27 Harv.L.Rev. 317, 334-35 (1914). In National Bank of Washington v. Dixon, 112 U.S.App.D.C. 183, 301 F.2d 507 (1961), this court approved the trial court’s submission to the jury, on the question of a landowner’s liability for personal injuries, the subsidiary question whether certain housing regulations were violated and if so whether the violation amounted to negligence.
. “Insofar as the appellees rely on lack of foreseeability as going to the issue of proximate cause, we point out this court has in the past said:
“[W]e are committed to the rule in negligence cases that where in the natural and continual sequence, unbroken by any intervening cause, an injury is produced which, but for the negligent act would I not have occurred, the wrongdoer will
be liable. And it makes no difference whether or not that particular result was foreseeable.
Hitaffer v. Argonne, 87 U.S.App.D.C. 57, 61, 183 F.2d 811, 815 (1950).
. If the jury were to find that the parent was contributorily negligent, the parent’s action in her own behalf would alone be affected.