MADRID, April 4 (Xinhuanet) -- A Tunisian national, the suspected mastermind of March 11 Madrid bombings, was among four suspected terrorists killed during a police operation in a suburb of the capital, Spanish Interior Minister Angel Acebes said Sunday.

¡¡¡¡Two or three people may have escaped before blasts, the minister said. Three of four suicide bombers have been identified,he added. Enditem