From Capitalist Media:
OAKLAND — Police arrested about 300 people Saturday as Occupy Oakland protesters were thwarted trying to take over a vacant convention center and a YMCA but later broke into City Hall, where they burned a flag taken from inside.
Police used tear gas and “flash” grenades in the afternoon against 2,000 protesters who tried to tear down fences around the vacant Henry Kaiser Convention Center, where they hoped to establish a new camp. Police said some demonstrators started throwing objects at officers. There were at least 19 arrests in the afternoon.
After 6 p.m. (9 p.m. ET), police in riot gear declared a group of protesters gathered near the YMCA under mass arrest for failing to disperse, according to local media reports and livestreams. Police said about 100 demonstrators were arrested at the YMCA.