Félix González Gago had two children, Marcos (11) and Mariano (9),who had both had been born in Chile, where Féliz had been the assistant to the defence attaché in the Spanish embassy for four years. 11 March was the younger boy’s birthday and Félix’s wife began to fear that something had happened to him when he did not call to wish him a happy birthday. Félix González, aged 52 years, was a sub-lieutenant in the air force and was on his way to the Moncloa HQ when a bomb went off on the train he was in, beside Calle Téllez. He normally took the bus, but that day had missed it.
11 March 2004 fell on a Thursday. Early that morning, a number of terrorists with links to Al-Qaeda planted thirteen bombs on four suburban trains covering routes running through Madrid. Ten of the bombs exploded between 7.37 and 7.39 am, when the trains were at Atocha, El Pozo and Santa Eugenia stations and alongside Calle Téllez. 191 people were killed in the attack and around 1,500 were wounded. It was the deadliest terrorist attack in Spanish history. On 3 April 2004, agents from the Special Operations Group (GEO) were about to enter an apartment in Leganés where the perpetrators of the attacks were believed to be hiding when the terrorists detonated twenty kilograms of explosives in an act of collective suicide. The ensuing blast killed one of the officers, bringing the total number of people killed by the 11 March bombers to 192.