Student shot on Widener University campus in Pa.

CHESTER, Pa. (AP) — Authorities say a student at Widener University in suburban Philadelphia was shot on campus and the university warned students to remain inside while police search for the shooter.

Chester police say that the student was shot while sitting in his car in the parking lot of the university's athletic center around 8:45 p.m. Monday. Police say he called 911 after the gunman shot him once in the side. Police were reviewing surveillance footage.

A spokesman for Crozer-Chester Medical Center says that the student is in critical, but stable condition Tuesday morning.

Widener spokesman Dan Hanson says that the shooting does not appear to have been a random act of violence.

The university says that police have secured the campus, but asked students to remain inside until 6 a.m.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

A gunman shot a college student sitting in the parking lot of Widener University's athletic center Monday, but officials said the campus was secure, even as they warned students to remain inside as police searched across the city for the shooter

Chester police said the student was shot once in the side by an unknown gunman around 8:45 p.m. Monday and he called 911 himself. The victim, who wasn't identified, was listed in critical, but stable condition at Crozer-Chester Medical Center Tuesday morning after undergoing surgery Monday night, the hospital said.

Widener said in a statement on its website that Chester police had secured the campus and did not believe there was an "active shooter" on the campus, but asked students to remain inside until 6 a.m.

Chester police were reviewing surveillance footage and were using K-9 units to track the suspect, who they believe fled into a residential neighborhood adjacent to the athletic complex, on the edge of the campus.

Police told reporters that they found one shell casing on the scene and believe the shooter used a revolver.

Widener University is a private, co-ed university located in Chester, Delaware County, 14 miles south of Philadelphia. The university also has three other campuses in Harrisburg, Exton and Wilmington, Del.