Van Natten said there was an increased police presence at the campus Friday.
Police said the threats were sent via text message to some students. The messages made reference to bombs on campus, according to investigators.
Students were taken to the Elks Lodge on Riverside Boulevard. The school says some students may have walked home.
The nature of the threats involved bombs, but a search of the campus came up empty, police said.
The school will continue to post updates on their Twitter account.