Vacated and remanded by unpublished PER CURIAM opinion.

Unpublished opinions are not binding precedent in this circuit.

Peter C. Curnin appeals the district *883 court’s order dismissing -with prejudice, * for failure to prosecute, his action brought on behalf of the United States under the qui tam provisions of the civil False Claims Act, 31 U.S.C. §§ 3729-3733 (2006). Although the district court cited no authority for its order, it appears that it intended to dismiss Cumin’s action pursuant to Fed. R.Civ.P. 41(b).

A district court has the inherent authority to dismiss a case for failure to prosecute, and Rule 41(b) “provides an explicit basis for this sanction.” Doyle v. Murray, 938 F.2d 33, 34 (4th Cir. 1991). Because dismissal is a severe sanction, the district court must exercise this power with restraint, balancing the need to prevent delays with the sound public policy of deciding cases on their merits. Dove v. CODESCO, 569 F.2d 807, 810 (4th Cir. 1978) (citing Reizakis v. Loy, 490 F.2d 1132, 1135 (4th Cir. 1974)). This Circuit therefore requires a trial court to consider four factors before dismissing a case for failure to prosecute: “(1) the plaintiffs degree of personal responsibility; (2) the amount of prejudice caused the defendant; (3) the presence of a drawn out history of deliberately proceeding in a dilatory fashion; and (4) the effectiveness of sanctions less drastic than dismissal.” Hillig v. Comm’r of Internal Revenue, 916 F.2d 171, 174 (4th Cir. 1990).

Although the district court stated that it dismissed Cumin’s • action for failure to request issuance of summons or to serve the Defendants within a reasonable amount of time, the record is silent as to whether the district court considered the above factors in dismissing the action with prejudice. Thus, we have no basis for assessing the district court’s ruling.

Accordingly, we vacate the dismissal. We remand so that, assuming the district court intended to exercise its authority under Rule 41(b), the court may apply the appropriate four-part analysis in determining whether dismissal with prejudice is appropriate. If the court intended to dismiss Cumin’s action on another ground, we direct that the court clarify its reasoning. We express no opinion as to whether dismissal with prejudice is appropriate under any analysis, as the district court is in the best position to make this determination in the first instance. We deny Cur-nin’s motion to seal as moot. We dispense with oral argument because the facts and legal contentions are adequately presented in the materials before the court and argument would not aid the decisional process.

VACATED AND REMANDED.