SOUTH PORTLAND, Maine (AP) — Southern Maine Community College has reopened after being shut down for more than four hours following a bomb threat.

Students, teachers and staff were evacuated from the South Portland campus and two satellite campuses in Brunswick and Bath after an anonymous caller to the school's security office said there were three bombs on campus.

Lt. Robb Couture of the South Portland Fire Department said the caller didn't provide further details and his number couldn't be traced.

Police used eight bomb-detection dogs to search buildings on the South Portland campus, but no explosive devices were detected. The college reopened early Monday afternoon with classes scheduled to resume at 4 p.m.

The college has nearly 7,500 full- and part-time students. About 2,000 were on campus at the time of the threat.