University spokeswoman Ellen Griffin said custodial staff called police at about 4 a.m. to report that a group of people had broken into the Cesar Chavez Student Center.
Officers responded and found about 19 protesters at the building. They took two into custody and the others scattered, Griffin said.
"The persons who dispersed were protesting and chanting outside of the building for a short period of time, but that dispersed as well," she said.
She said she had heard the group may have been protesting disciplinary actions against demonstrators involved in the takeover of a building on campus in December.
Griffin said there was an initial report that a window had been broken this morning, but an inspection of the building has so far revealed no damage.