MADRID – Spain marked the sixth anniversary of the Madrid train bombings, Europe’s worst Islamist attack, on Thursday with a moment of silence in parliament and other formal ceremonies to remember the 191 people who died and nearly 2,000 who were injured. Some people laid flowers at the commuter rail stations which were hit when the 10 backpacks filled with explosive and nails went off on four trains during the morning rush hour on March 11, 2004 in the al-Qaida inspired attack.