The Louisiana State University reported a bomb threat had been called in to campus this morning and directed everyone to "evacuate as calmly and quickly as possible."

Update at 8:03 p.m. ET: Dormitories, some dining halls and the student recreation center have reopened, the university has announced.

Still no details about the threat.

Update at 5:58 p.m. ET: Buildings are still being searched, and those "deemed ready to return to normal operations will be determined on a building-by-building basis," the university says.

"A decision [to evacuate] had to be made to protect those for whom we are clearly responsible," Chancellor William Jenkins said.

The threat was called in at 10:30 a.m., an hour before the evacuation alert was issued, LSUPD spokesman Capt. Corey Lalonde told the student paper, the LSU Reveille.

Update at 3:55 p.m. ET: LSU has canceled all remaining campus events today as the investigation continues. Police have not released any details about the alleged threat.

Update at 2:49 p.m. ET: LSU says on its website that it "continues to investigate the bomb threat" and asks everyone to stay off campus until directed to return.

Update at 1:44 p.m. ET: Gannett Louisiana reports that the threat was called into the East Baton Rouge Parish 911 office.

"We determined there was a need to evacuate the campus," said Associate Vice Chancellor Herb Vincent.

Gannett Louisiana says traffic on campus after the alert went out "resembled the end of a Saturday night football game."

Update at 1:26 p.m. ET: WAFB-TV reports that the order could affect tens of thousands of students at the university in Baton Rouge. The evacuation alert was sent at 11:32 a.m. CT.

The University of Texas-Austin and North Dakota State University also evacuated their campuses on Friday after receiving bomb threats. No explosives were found.