Ricardo Calero-Colon ("Calero") and Eric Robles-Abraham ("Robles") challenge a district court ruling dismissing their civil rights action under 42 U.S.C. Sec. 1983 for failure to state a claim upon which relief may be granted. See Fed.R.Civ.P. 12(b)(6). As the district court incorrectly concluded that their claims were time-barred, we vacate the judgments and remand for further proceedings.

* BACKGROUND1

On February 9, 1993, Calero commenced this action against various police officers of the Commonwealth of Puerto Rico and their confidential informants. Robles followed suit on November 2, 1993, and the cases were consolidated. At the heart of both complaints are allegations that Jose Crespo-Guillen ("Crespo")--an undercover Puerto Rico police officer--and a confidential informant named Rosa, persuaded certain Commonwealth authorities to provide front money for undercover drug buys which never were intended to take place. The complaints asserted that Crespo and Rosa falsely identified appellants as the "sellers" in two concocted undercover drug buys, thereby causing arrest warrants to issue against each. Calero was arrested on August 1, 1990, and Robles on March 20, 1992, for allegedly selling one ounce of cocaine to Crespo. On July 1, 1992, Calero was acquitted; Robles was acquitted on July 2, 1993.

Although both Calero and Robles maintained their innocence from the moment of their respective arrests, each claims that he did not know the true nature and extent of the scheme that led to the arrest until after he had been acquitted. In all events, within months of their respective acquittals, Calero and Robles initiated lawsuits alleging violations of the Fourth and Fourteenth Amendments to the United States Constitution and violations of Puerto Rico law. Shortly thereafter, the appellees moved to dismiss on the ground that the claims were time-barred.

The district court deemed appellants' claims analogous to the common law torts of false arrest and malicious prosecution. It found that the one-year limitation borrowed from Puerto Rico law barred their respective false arrest claims, which accrued at the dates of arrest.2 Although the court ruled that their "malicious prosecution" type claims were not time-barred, it held them not actionable under section 1983, whether on a substantive or procedural due process theory. See Albright v. Oliver, --- U.S. ----, 114 S. Ct. 807, 127 L. Ed. 2d 114 (1994) (refusing to recognize substantive due process right to be free from prosecution not based on probable cause); Perez-Ruiz, 25 F.3d at 43 (commonwealth law affords adequate post-deprivation remedy for "procedural due process" type "malicious prosecution" claims). As no trialworthy federal claims remained, the pendent commonwealth law claims were dismissed without prejudice pursuant to 28 U.S.C. Sec. 1367(c)(3). See Figueroa Ruiz v. Alegria, 896 F.2d 645, 650 (1st Cir.1990).

Section 1983 creates "a species of tort liability" for redressing deprivations of federal constitutional rights. Heck v. Humphrey, --- U.S. ----, ----, 114 S. Ct. 2364, 2370, 129 L. Ed. 2d 383 (1994) (quoting Memphis Community Sch. Dist. v. Stachura, 477 U.S. 299, 305, 106 S. Ct. 2537, 2542, 91 L. Ed. 2d 249 (1986)). The limitation period governing personal injury actions under the law of the forum state is borrowed for application to section 1983 claims. Wilson v. Garcia, 471 U.S. 261, 276-80, 105 S. Ct. 1938, 1947-49, 85 L. Ed. 2d 254 (1985); Guzman-Rivera v. Rivera-Cruz, 29 F.3d 3, 4-5 (1st Cir.1994). The one-year limitation period prescribed in Article 1868(2) of the Civil Code of Puerto Rico, P.R.Laws Ann. tit. 31, Sec. 5298(2) (1991), governs these section 1983 claims.

B. Accrual Rules Governing Section 1983 Claims

The question before us is whether appellants brought their section 1983 claims within the applicable one-year period prescribed by Puerto Rico law. The dispute focuses on when the one year began to run; in other words, when their respective causes of action accrued. Federal law provides the applicable accrual rule. Guzman-Rivera, 29 F.3d at 4-5.

Section 1983 claims accrue when the plaintiff "knows or has reason to know of the injury which is the basis of the action." Street v. Vose, 936 F.2d 38, 40 (1st Cir.1991) (quoting Torres v. Superintendent of Police, 893 F.2d 404, 407 (1st Cir.1990)). For purposes of determining when a claimant knew or had reason to know of the alleged injury, we look to the common law cause of action most closely analogous to the constitutional right at stake. Heck, --- U.S. at ----, 114 S. Ct. at 2371. As the elements in any species of section 1983 "tort" are ordained by its constitutional prototype, we first identify the particular constitutional right allegedly infringed. See Albright v. Oliver, --- U.S. ----, ----, 114 S. Ct. 807, 811, 127 L. Ed. 2d 114 (1994).

These complaints specifically state that Puerto Rico police officers arrested Calero and Robles pursuant to a warrant predicated on false allegations by Crespo and Rosa. Thus, appellants' section 1983 claims directly implicate both their Fourth Amendment right to be free from any unreasonable seizure of their persons, see Lippay v. Christos, 996 F.2d 1490, 1502-03 (3d Cir.1993) (discussing Fourth Amendment standards in case involving arrest based on warrant), and their Fourteenth Amendment right to be free from criminal prosecution without due process of law.4

The district court found the Fourteenth Amendment due process claims more closely analogous to the tort of malicious prosecution, but that the Fourth Amendment claims more closely resembled the common law tort of false arrest. Even though malicious prosecution5 and false arrest6 may seem distinct enough in abstract definition, however, in a wrongful arrest case--particularly an arrest conducted pursuant to a warrant based on false allegations--the lines between the two may become blurred. In the present case, we believe appellants' Fourth Amendment claims more closely resemble the common law tort of malicious prosecution as well.7

The Supreme Court has noted that the common law cause of action for malicious prosecution, unlike false arrest, permits damages for confinement pursuant to legal process. Heck, --- U.S. at ----, 114 S. Ct. at 2371. The interest at stake in a malicious prosecution claim is the right to be free from deprivations of liberty interests caused by unjustifiable criminal charges and procedures. In contrast, false arrests infringe upon the right to be free from restraints on bodily movement.8 The remedies available in the two tort actions mirror the different interests at stake. Damages for false arrest are restricted to the time period between the initial detention and the issuance of legal process, whereas the tort of malicious prosecution contemplates general damages as well as compensation for any arrest and imprisonment preceding the termination of the criminal proceeding. Id.

The critical inquiry that distinguishes malicious prosecution from false arrest in the present context is whether the arrests were made pursuant to a warrant. Singer v. Fulton County Sheriff, 63 F.3d 110, 115-116 (2d Cir.1995). As a general rule, an unlawful arrest pursuant to a warrant will be more closely analogous to the common law tort of malicious prosecution. An arrest warrant constitutes legal process, and it is the tort of malicious prosecution that permits damages for confinement pursuant to legal process. On the other hand, wrongful warrantless arrests typically resemble the tort of false arrest. Id.

For the foregoing reasons, we hold that--for purposes of determining the appropriate accrual rule--both the Fourth and Fourteenth Amendment claims more closely resemble the common law tort of malicious prosecution. Consequently, appellants' section 1983 claims did not accrue until their respective criminal prosecutions ended in acquittals. Heck, --- U.S. at ----, 114 S. Ct. at 2371; Guzman-Rivera, 29 F.3d at 5.

All that remains is to apply the accrual rule. Calero was acquitted on July 1, 1992. Well within the one-year limitation--on February 9, 1993--he commenced the present action. Similarly, Robles was acquitted on July 2, 1993, and brought suit on November 2, 1993. Thus, their section 1983 claims are not time-barred.

In sum, reference to common law tort principles is appropriate in identifying the most suitable rule of accrual for application to section 1983 claims, always bearing in mind the legislative aims which Congress sought to advance by establishing a federal forum for redressing deprivations of constitutional rights. Cf. Wyatt v. Cole, 504 U.S. 158, 163-164, 112 S. Ct. 1827, 1831, 118 L. Ed. 2d 504 (1992) (noting that common law immunities are not necessarily applicable to section 1983 claims). Accordingly, the essential elements of actionable section 1983 claims derive first and foremost from the Constitution itself, not necessarily from the analogous common law tort. See Graham v. Connor, 490 U.S. 386, 394-97, 109 S. Ct. 1865, 1870-72, 104 L. Ed. 2d 443 (1989) (analyzing excessive force claim under Fourth Amendment standards). Consequently, on remand Calero and Robles must establish that their respective Fourth Amendment rights were violated by one or more appellees. See, e.g., Lippay, 996 F.2d at 1502-03 (discussing one theory of liability for violating the Fourth Amendment).

The district court judgments are vacated, and the case is remanded for further proceedings consistent with this opinion. Costs are awarded to appellants.

LYNCH, Circuit Judge, concurring.

I write separately to stress my understanding that in Fourth Amendment claims under Sec. 1983 arising out of a warrantless arrest the statute of limitations may typically, but does not necessarily, begin to run at the time of arrest.

There may be circumstances in which plaintiffs neither knew, nor had reason to know, at the time of their warrantless arrests that they had suffered a constitutional injury and so the statute would not begin to run upon arrest. Similarly, the arrest may lead to a chain of events leading to a different characterization of the entire constitutional injury, and so a different accrual date. See Robinson v. Maruffi, 895 F.2d 649, 654-55 (10th Cir.1990). That the common law of false arrest has often been interpreted to establish that the common law cause of action accrues upon the arrest1 does not answer the question of the accrual date for Sec. 1983 actions. The Supreme Court in Albright v. Oliver, --- U.S. ----, 114 S. Ct. 807, 127 L. Ed. 2d 114 (1994), and earlier cases, see, e.g., Graham v. Connor, 490 U.S. 386, 395, 109 S. Ct. 1865, 1871, 104 L. Ed. 2d 443 (1989), has instructed federal courts to look to the true nature of the constitutional claims being asserted, rejecting labels.

As Judge Cyr's very thoughtful opinion states: "[t]he essential elements of actionable section 1983 claims derive first and foremost from the Constitution itself, not necessarily from the analogous common law tort." Accordingly, the law does not, I believe, bind the accrual date for the constitutional tort in warrantless arrests inevitably and invariably to the date of arrest. The case of a warrantless arrest is not before us, and no more now need be said.