A Thai Buddhist monk puts on a gas mask as riot police use water cannon and tear gas while anti-government protesters attempt to remove barricades outside Government House in Bangkok December 2, 2013. Thai protesters took to the streets on Monday to renew their fight to topple Prime Minister Yingluck Shinawatra, prompting riot police to fire teargas and stun grenades for a second day outside her fortified office compound to keep them at bay. REUTERS/Dylan Martinez (THAILAND - Tags: CIVIL UNREST POLITICS RELIGION TPX IMAGES OF THE DAY)