The 2004 Madrid train bombings (also known as 11-M, 3/11, 11/3 and M-11) were a series of coordinated bombings against the commuter train system of Madrid, Spain on the morning of 11 March 2004, which killed 191 people and wounded over 1700.
Atocha Station (train number 21431) - Three bombs exploded. Based on the video recording from the station security system, the first bomb exploded at 7:37, and two others exploded within 4 seconds of each other at 7:38.