Occupy Oakland and local police came to a confrontation Tuesday morning, resulting in the arrests dozens of protesters and the destruction of the tent city where they had been living.

According  to the San Jose Mercury News, the police arrived on the scene in Oakland at around 4:30 a.m., including some in full riot gear with batons. The paper reported that some protesters were throwing objects at the police and chanted police go home, cops go home.

At around 4:40 a.m., the police made an announcement asking the protesters to clear out of the park they were living in, according to the San Francisco Chronicle.

Attention all persons in Frank Ogawa Plaza. It has been determined you are illegally blocking Frank Ogawa Plaza and are the subject to arrest, said the officer, according to the Chronicle. Those remaining in the park will be arrested, he said.

The Chronicle reported one incident of violent confrontation, with police firing a non-lethal projectile at a protester who had lobbed a bottle.

Most of the arrests, according to the Chronicle, were made between 4:57 and 5:55 a.m.

This isn't the first of the occupy protests to spur arrests and confrontation.

Earlier this week, nurses in Chicago protested outside the door of Mayor Rahm Emmanuel after police arrested their colleagues at the Occupy Chicago protest in Grant Park.

Arrests have occured in other cities as well, including Cincinnatti and Philidelphia.