The 2004 Madrid Train Bombings were a series of coordinated terrorist attacks that occurred on March 11, 2004, in Madrid, Spain. Ten bombs were detonated on four commuter trains during the morning rush hour, killing 191 people and injuring over 2,000 others. The attacks were carried out by an Islamist extremist group and were the deadliest in Spanish history. In the aftermath, the Spanish government faced criticism for its handling of the situation. The attacks significantly influenced the country's politics, leading to a change in government during the general elections held just days later. The bombings also raised concerns about security and terrorism in Europe.