Summer Freeman, spokeswoman for Chester Mayor John Linder, said there appears to have been "an association" between the victim and the shooter, based on evidence investigators recovered from surveillance tapes.
"This is not being treated as an active-shooter-on-campus situation," she said. "This is an incident that has taken place on campus between individuals that appear to be associated, as per the evidence from the surveillance."
The suspect was still at large last night, but authorities said the attack appeared to be targeted and the shooter was believed to have fled into the Sun Hill neighborhood, which borders the Delaware County campus. Police used K-9 teams to search for the gunman there and in the surrounding woods.
"All indications are that this was not a random act of violence," Widener University spokesman Dan Hanson said.
Detectives with the Delaware County District Attorney's Office Criminal Investigation Division are assisting Chester officers with the case, Freeman said.
City officials and Hanson declined to release further information about the student or his injuries, saying the family asked for privacy.
Widener enrolls 6,300 undergraduate and graduate students on four campuses. Chester is its main campus.