On October 24 , a commando unit formed by at least five members of ETA stole around 300 revolvers and 50 pistols , as well as ammunition , from an arms warehouse in Vauvert , France , and on November 4 , the Basque newspaper Gara released an ETA private document in which it warned the Spanish government that the " peace process " was " in crisis " . After the bombing , the ABC newspaper reported that before the attack , ETA had reminded Rodríguez Zapatero about the 2004 Madrid train bombings as a way to pressure the Government . During the ceasefire , street violence around the Basque Country , known as kale borroka , did not stop
2004 Madrid train bombings
2004 Madrid train bombings
2006 Madrid–Barajas Airport bombing