During a press conference on Sunday, Assistant Police Chief Jason Swaim of the Winston-Salem Police Department said it remained unclear whether the shootings were connected, Xinhua reported.

The campus was placed under lockdown shortly after the incidents, which was lifted early Sunday morning. Police said extra officers wound be on and around campus in the coming days.

No arrests have been announced. Swaim said the investigation was in its early stages.

The university was in the middle of its homecoming weekend.