Barbra Piotrowski appeals the district court’s dismissal of her civil rights suit against the City of Houston (the “City”), 1 which she brought under 42 U.S.C. § 1983 (1988). We modify and affirm.
I
In 1980, gunmen shot Barbra Piotrowski in an attempt to kill her. 2 According to Pio-trowski’s complaint, Rick Waring told officers of the Houston Police Department five weeks prior to the shooting that Dudley Bell had solicited him to murder Piotrowski. 3 The officers allegedly told Waring that they would investigate his information and instructed him not to warn Piotrowski of the attempt to solicit her murder. Contrary to their assurances to Waring, the officers did not proceed to investigate. 4
Piotrowski sued the City in 1993, alleging that the offiсers had interfered with Waring’s attempts to warn her of the danger she faced and that other officers had aided Bell and the other persons conspiring to kill her by providing them with a picture of her. Piotrow-ski stated that she had not learned of these actions until January, 1993, when one of the officers revealed the alleged interference and affirmative assistance in a deposition for a civil case concerning a book written about Piotrowski. The district court granted the City’s motion to dismiss with prejudice under Rule 12(b)(6) of the Federal Rules of Civil Procedure on the grounds that Piotrowski’s complаint was time-barred. Piotrowski appeals that dismissal.
II
Piotrowski contends that the district court erred in dismissing her suit as time-barred. ‘We review a Rule 12(b)(6) dismissal de novo. We must accept all well-pleaded facts as true, and we review them in the light most favorable to the plaintiff.”
Green v. State Bar of Texas,
The district сourt found that Pio-trowski’s claim was that the Police Department violated her civil rights when it failed to investigate Waring’s story and failed to protect her from Bell and Minns, and decided that such claims accrue at the time of the injury. Because Piotrowski knew at the time she was shot that the Police Deрartment had failed to protect her, the district court held that her claim had accrued in 1980, more than two years before she filed suit. 5 Pio- *515 trowski argues, however, that she is making more than a fañure-to-protect claim. She argues that her complaint states a § 1983 claim for a violation of her civil rights that resulted from affirmative acts of the Police Department that contributed to the danger she faced, and that her claim did not accrue until she acquired knowledge of these acts in January, 1993.
A
Piotrowski argues that the police officers’ affirmative acts of preventing Waring from warning hеr and giving the conspirators her picture support a § 1983 claim of a “state-created danger.”
6
“To state a claim under § 1983, a plaintiff must (1) allege a violation of rights secured by the Constitution or laws of the United States and (2) demonstrate that the alleged deprivation was committed by a persоn acting under color of state law.”
Leffall,
Generally, “nothing in the language of the Due Process Clause itself requires the State to protect the lifе, liberty, and property of its citizens against invasion by private actors.”
DeShaney v. Winnebago County Dep’t of Social Servs.,
Piotrowski contends that her allegations qualify by satisfying the “state-created danger” theory of § 1983 liability.
7
While this Court has not affirmatively held that this theory is a valid exception to the
DeShaney
rule,
see Johnson,
B
Before we reach whether a “state-created danger” constitutes a cognizable § 1983 theory, we determine first whether the district court correctly held that the statute of limitations would bar such a claim. Piotrоwski contends that her claim accrued in January, 1993, when she discovered the relevant information from the police officer’s deposition.
“Under federal law, the [limitations] period begins to run ‘the moment the plaintiff becomes aware that he has suffered an injury or has sufficient information to knоw that he has been injured.’ ”
Russell v. Board of Trustees,
The City argues that Piotrowski either knew of the facts underlying her claim
*517
at the time of the attack or should have inquired into the actions of the police officers at that time. In response, Piotrowski alleges that the police officers took active steps to suppress any information concerning their prior knowledge of the threat. When a defendant controls the facts surrounding causation such that a reasonаble person could not obtain the information even with a diligent investigation, a cause of action accrues, but the statute of limitations is tolled.
See United States v. Kubrick,
C
We need not decide, however, whether Piotrowski’s “state-created danger” claim is a cognizable § 1983 theory that is not time-barred. Even if she has alleged a “state-created danger,” she has failed to allege facts that implicate the City itself. A municipality dоes not incur liability under § 1983 “unless action pursuant to official municipal policy of some nature caused a constitutional tort.”
Monell v. Department of Soc. Servs.,
Piotrowski alleges that the police officers increased the threat to her life, but she does not allege that the increased danger resulted from the City’s policies. Nowhere in her substantive due process claim does Piotrowski allege that a causal link existed between a City policy or custom and the alleged state-created danger. Rather, she alleges that the increased danger resulted from the actions of certain police officers. Because the City cannot be held liable under a
respondeat superior
theory,
Monell,
Ill
For the foregoing reasons, we AFFIRM the dismissal of Piotrowski’s suit. We modify the district court’s judgment, however, to dismiss without prejudice to Piotrow- *518 ski’s right to file an amended complaint. 14
Notes
. Piotrowski’s claim against the Houston Police Department as a separate defendant was dismissed and is not at issue in this appeal.
. Piotrowski alleged that Dudley Bell, who worked for her boyfriend, Richard Minns, hired the gunmen.
. Piotrowski alleged that Waring worked for Bell.
. Piotrowski also alleged that she had reported previously to the police that Minns was trying to kill her.
. Congress has not provided a statute of limitations in § 1983 cases; therefore, federal courts borrow the forum state's general personal injury limitations period.
See Owens v. Okure,
. Piotrowski also argues that the police officers’ actions created a "special relationship” that required them to protect her. Our recent en banc decision in
Walton v. Alexander,
. In
Salas v. Carpenter,
.
See Leffall,
Even under the rationale of the cases recognizing a state-created danger theory of § 1983 liability, it is not enough to show that the state *516 increased the danger of harm from third persons; the § 1983 plaintiff must also show that the state acted with the rеquisite culpability in failing to protect the plaintiff from that danger to make out a constitutional violation.
Id.
at 530-31. Deliberate indifference requires the following: "[TUhe environment created by the state actors must be dangerous; they must know it is dangerous; and ... they must have used their authority to create an opportunity that would not otherwise have existed for the third party's crime to occur.”
Johnson,
. Because we hold that Piotrowski’s allegations fail on other grounds, however, we do not reach the question of whether her allegations satisfy the Rule 12(b)(6) threshold for alleging a "state-created danger” theory of § 1983 liability.
. When a § 1983 cause of action accrues is a question of federal law. Id.
.
See also Chapman v. Homco, Inc.,
.
See also Stewart,
. Nor can we say as a matter of law that the limitations period did not start until January, 1993, when Piotrowski learned of the police officer’s deposition. Although she acquired actual knowledge of the facts at that time, the City suggests that she could have obtained that information earlier. The lawsuit for which the 1993 deposition was taken concerned libel and slander claims brought by the police officers against the author of a book written about Piotrowski’s case. The author acknowledges in the book that Pio-trowski helped her develop the book. Alleging that the book discussed at least some of the relevant actions оf the police officers, the City suggests that Piotrowski either knew or should have known of the police officers' actions prior to the 1991 publication of the book. Determining the validity of the City’s contention, however, would require us to go beyond the pleadings, and we will not entertain it at this time.
. We dismiss without рrejudice because we cannot say as a matter of law that Piotrowski cannot allege any set of facts supporting a causal link between a City policy and the alleged increased danger; we merely hold that she has not done so in the complaint filed in this case.
See Nat'l Ass’n of Gov’t Employees
v.
City Pub. Serv. Bd.,
