Philippine National Police Chief for National Capital Region Nicanor Bartolome displays a computer-generated sketch of two men who might provide key information to a bus explosion four days ago during a "Day of Mourning and Prayer" event Friday, Jan. 28, 2011, at the site along an EDSA highway at the financial district of Makati city, southeast of Manila, Philippines. Five people were killed and 13 others wounded in the bus explosion Tuesday, the bloodiest attack in the heart of the capital in six years. (AP Photo/Bullit Marquez)