Police are investigating a bomb threat at a small college in central Virginia that prompted a campus-wide lockdown overnight, according to university officials.

Southern Virginia University received a telephone threat just before 10 p.m. Sunday, claiming that bombs had been placed around campus.

School officials evacuated several residence halls, and bomb-sniffing dogs were brought in to help Buena Vista police search the area.

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The school’s 750 student were notified of the safety alert by email and text message, and updates were posted on the school’s Web site.

Students were given the green light to return to the residence halls around 3:48 a.m. Monday. The lockdown was lifted at 5:30 a.m.

According to the school Web site, every building on campus was checked visually and with canine squads. No bombs were found. All classes will be held as scheduled on Monday.

Police said the investigation is ongoing and ask that anyone who has information or sees anything suspicious should call 911.

Southern Virginia University is located in Rockbridge County, about 190 miles southwest of Washington, D.C.