SAN FRANCISCO (KRON) — San Francisco State University is closed Thursday because of a bomb threat, campus police said.

The threat affected several buildings on the campus.

As if 6:30 p.m., the campus was given the all clear.

It will remain closed Thursday and will reopen Friday morning.

University police and San Francisco police worked all afternoon to investigate the threat.

Students and staff were not allowed on campus while the threat was investigated.

As of Thursday night, police were searching buildings one by one.

One residential building was evacuated — building C in Centennial Village — along with several other buildings.

No other residential buildings were evacuated at this time.

Final exams are underway this week at the university, but have been cancelled this evening.

The university says any exams scheduled for tonight will be rescheduled.