Occupy protest resurfaces in Oakland after lull

It started peacefully enough: A midday rally at City Hall and a march. But as the day wore on, Oakland was hit by the most turbulent protests in weeks as Occupy demonstrators clashed repeatedly with police, leaving more than 400 people arrested.

The demonstrations in downtown Oakland broke a lull that had seen just a smattering of people taking to Oakland's streets in recent weeks for occasional marches that bore little resemblance to the headline-grabbing Occupy demonstrations of last fall.

That all changed Saturday with clashes punctuated by rock and bottle throwing by protesters and volleys of tear gas from police, and a City Hall break-in that left glass cases smashed, graffiti spray-painted on walls and an American flag burned.

AP photos showing the flag burning _ including images of masked protesters touching off the blaze, a woman urging protesters not to burn it, and another of an officer stomping out the fire _ drew attention on social networking sites.

At least three officers and one protester were injured. Police spokesman Sgt. Jeff Thomason said there were more than 400 arrests on charges ranging from failure to disperse to vandalism,

On Sunday, Oakland officials vowed to be ready if Occupy protesters try to mount another large-scale demonstration. Protesters, meanwhile, decried Saturday's police tactics as illegal and threatened to sue.

Mayor Jean Quan personally inspected damage caused by dozens of people who broke into City Hall. She said she wants a court order to keep Occupy protesters who have been arrested several times out of Oakland, which has been hit repeatedly by demonstrations that have cost the financially troubled city about $5 million.

Quan also called on the loosely organized movement to "stop using Oakland as its playground."

"People in the community and people in the Occupy movement have to stop making excuses for this behavior," she said.

Saturday's protests _ the most convulsive since Oakland police forcefully dismantled an Occupy encampment in November _ came just days after the announcement of a new round of actions. The group said it planned to use a vacant building as a social center and political hub and threatened to try to shut down the Port of Oakland for a third time, occupy the airport and take over City Hall.

After the mass arrests, the Occupy Oakland Media Committee criticized the police's conduct, saying that most of the arrests were made illegally because police failed to allow protesters to disperse. It threatened legal action.