From The Guardian:
On the morning of March 11 2004, as thousands of commuters made their way to work, 10 bombs packed with nails and dynamite exploded on four trains heading into central Madrid. The blasts killed 191 people and injured nearly 1,800. It was the worst Islamist terrorist attack in European history. Clara Escribano, who was travelling to work when her train was torn apart in one of the attacks, still lives with the memory. “I have a film of that day constantly playing in my head,” she said. “I still haven’t been able to get on a train. In fact, I cannot even walk on the same side of the road as the station where I got on the train.”
The events of 11-M, as the attacks are known in Spain, initially divided the country along political lines. The bombings were carried out just three days before a general election, which saw the incumbent conservative Popular party (PP) of José María Aznar defeated by the Socialist PSOE led by José Luis Rodríguez Zapatero. From the moment the attacks took place, the PP argued that they were the work of the Basque separatist group Eta; Mr Aznar went so far as to phone national newspaper editors, assuring them this was the case. Despite evidence soon emerging of a van containing detonators linked to the attacks and a recording of verses from the Qur’an, the PP stuck to its line.