MADRID, SPAIN - MARCH 11:  People wait for trains at Atocha railway station during the 10th anniversary of Madrid train bombings on March 11, 2014 in Madrid, Spain. Spain's worst terrorist attack killed 192 people and injured another 1,857 in the early hours of March 11, 2004, after devices exploded in four commuter trains heading to Atocha Railway Station. Former Spanish Prime Minister Jose Maria Aznar and his government said the attack was carried out by the ETA, a Basque separatist group, but the judicial investigation discounted the theory.  (Photo by Pablo Blazquez Dominguez/Getty Images)