An early-morning shooting left three dead and one in critical condition at the University of Alberta campus in Canada, police said Friday, June 15, according to AP.

The shooting was an apparent armed robbery of an armored vehicle or vehicles, police spokesman Scott Pattison said.

Police continue to look for the shooter or shooters.

"The university was quickly put into lockdown," Pattison said. "It's a crime scene, so students are required to stay in their dorms."

The police spokesman said no students were involved.

The shooting happened shortly after midnight in the Hub Mall area, which is a combination of student residences and shops.

It's the university's summer session, so fewer students are living on campus.

"The university is saddened about those who lost their lives last night and we extend our condolences to their loved ones," the university said on its website.

It said the rest of the campus is operating as normal.