An anti-government "red shirt" protester sits outside a shopping centre in the main shopping district in Bangkok April 15, 2010. Thailand's "red shirts" congregated in their tens of thousands at an upmarket Bangkok shopping district on Wednesday, preparing a "final battleground" in their fight to oust army-backed Prime Minister Abhisit Vejjajiva. REUTERS/Vivek Prakash (THAILAND - Tags: POLITICS CIVIL UNREST)