Three men charged with placing backpack bombs on rush-hour commuter trains in Madrid denied having any role in the 2004 terror attacks, despite witness accounts that placed them on the convoys. The three were among 29 defendants now on trial for the massacre that killed 191 people and wounded more than 1,800 in Europe worst Islamic-linked terror attack. The trial, in its third day Monday, was expected to last at least five months. One of the three alleged bombers who testified Monday insisted his mother could vouch for him, saying he was in bed asleep when the bombs went off on March 11, 2004, and that she had fixed him breakfast. Another defendant said he had been at a restaurant miles (kilometers) away when the trains blew up.