At least two people were killed and and eight wounded in a shooting at Brown University on Saturday during final exams on the Ivy League campus, authorities said, as police searched for the suspect.

Officers were hunting through campus buildings and sifting through trash cans more than three hours after the shooting erupted.

Mayor Brett Smiley said a shelter-in-place was in effect for the area and encouraged people living near the campus to stay inside and not to return home until it is lifted.

The shooting occurred in the Barus & Holley building, a seven-story complex that houses the School of Engineering and physics department.

According to the university’s website, the building includes more than 100 laboratories, dozens of classrooms and offices.

Engineering design exams were underway there when the shooting occurred.