Student protesters are blocking all entrances to the University of California, Santa Cruz, campus as part of an ongoing demonstration against tuition hikes and police violence.

The university issued an online alert telling people not to come to campus Thursday because access is blocked.

According to the campus website, students and other protesters blocked the west entrance to campus. Protesters then showed up at the main gate.

On Tuesday, police arrested six protesters who shut down a highway for several hours by chaining themselves to bins filled with concrete placed in lanes.

The California Highway Patrol used jackhammers, saws and crowbars to unwind the tangle of chains and concrete. The suspects were arrested on suspicion of creating a public nuisance, failure to obey an officer and conspiracy.

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Information from: San Francisco Chronicle, http://www.sfgate.com