'Dozens of police cars, fire engines surrounded the area, while more than 200 riot police raided the campsite at Justin Herman Plaza around 2 a.m. on Wednesday, Reuters reported.

The San Francisco camp of several hundred protesters was the last large Occupy encampment standing after police dismantled tent cities in Los Angeles and Philadelphia last week.

According to the police, more than 50 protesters were arrested and two officers were assaulted during the raid. Some protesters returned to the area and were reportedly planning to set up camps in other places.'

Read more: Police Raid Occupy San Francisco Camp