On June 28, 2004, a series of coordinated bombings targeted commuter trains in Madrid, Spain, killing 191 people and injuring over 2,000. The attacks were carried out by Islamic extremists, and the tragedy is considered one of the deadliest in Europe since World War II. The bombings were timed to coincide with the Spanish general elections, and they led to widespread political and social upheaval. The attacks heightened global concerns about terrorism and the security of public transportation. They also prompted stronger counter-terrorism measures across Europe.