Lafayette Fire Department firefighters on the campus of the University of Louisiana at Lafayette on Wednesday. (Paul Kieu/Lafayette Daily Advertiser via AP)

The University of Louisiana at Lafayette canceled classes and events on Wednesday after a bomb threat on campus, school officials said.

No explosives were found, the school said, but the threat forced students to evacuate, shut down streets on the campus and canceled orientation activities as police teams swept the campus.

Authorities from the Federal Bureau of Investigation, the Louisiana State Police, the Lafayette police force and the campus police department all responded to the threat, according to the school. An investigation is ongoing.

Summer classes at the university began on June 9 and run through Aug. 8. In addition, fall orientation was occurring on Wednesday, bringing additional students to the campus.

The Lafayette campus is located about 60 miles west of Baton Rouge, La. School officials said the campus should be fully open on Thursday.