A man removes blood stains from the floor of Mustansiriya University's Economy and Administration college after a suicide bomb attack in Baghdad February 25, 2007. A suicide bomber wearing a vest packed with explosives killed up to 40 people in a Baghdad college on Sunday, a day after Prime Minister Nuri al-Maliki expressed optimism about a security crackdown in the capital. REUTERS/Kareem Raheem (IRAQ)