Texas Southern University issued an all-clear Wednesday evening, after a bomb threat to the school prompted an evacuation that afternoon.

About 1:30 p.m., a Houston Emergency Center dispatcher was contacted by a male caller who made a threat against the Texas Southern campus, according to Steve Scheffler, a university spokesman. The dispatcher immediately called Texas Southern’s Department of Public Safety, and the evacuation of the campus began, Scheffler said.

Several law enforcement agencies are sweeping the campus, he said.

The university issued alerts by text, email and social media.