OAKLAND, Calif. (AP) — Police in Oakland began clearing out a weeks-old encampment after issuing several warnings to Occupy demonstrators.Oakland police and officers from several other San Francisco Bay area cities encircled the downtown encampment at about 4:30 a.m. PST, then moved in at about 6 a.m. Officers were seen escorting handcuffed protesters away from the camp soon afterward.The action comes a day after police drove hundreds of anti-Wall Street demonstrators from encampments in Portland, arresting more than 50 people.Oakland officials stepped up calls for an end to their city's encampment after a man was shot and killed Thursday near the camp. Oakland police issued a fourth cease and desist order Sunday night telling demonstrators they couldn't camp in the plaza.