Riot police spray coloured water using water guns to identify and arrest protesters from pedestrians during a rally mourning deceased former President Roh Moo-hyun and denouncing current President Lee Myung-bak in front of the Seoul city hall May 30, 2009, one day after Roh's funeral. Protesters demanded President Lee's apology as they say Roh's suicide was caused by political retaliation. REUTERS/Jo Yong-Hak (SOUTH KOREA CONFLICT POLITICS OBITUARY)