Buddhist monks receive food from a supporter of the yellow-shirted People's Alliance for Democracy during a rally outside Government House in Bangkok February 2, 2011. Thai "yellow shirt" demonstrators have returned to Bangkok's streets, threatening a prolonged protest if the government fails to revoke an agreement with Cambodia aimed at solving a long-running border dispute. REUTERS/Chaiwat Subprasom (THAILAND - Tags: POLITICS CIVIL UNREST RELIGION)