An injured protester is assisted after riot police used tear gas during clashes outside the metropolitan police headquarters in Bangkok August 29, 2008. Protesters trying to overthrow Thailand's government launched an attack on Bangkok's police headquarters on Friday as demonstrations against Prime Minister Samak Sundaravej spread from the capital. REUTERS/Stringer (THAILAND). THAILAND OUT. NO COMMERCIAL OR EDITORIAL SALES IN THAILAND.
REUTERS/STRINGER/THAILAND