The Armenian Revolutionary Army claimed responsibility for attack.[4] A typewritten message signed by the Armenian Revolutionary Army delivered to The Associated Press office in Lisbon said: "We have decided to blow up this building and remain under the collapse. This is not suicide, nor an expression of insanity, but rather our sacrifice to the altar of freedom."[2] The group said the attack had been carried out because "Turkey and its allies refused to acknowledge the genocide of Armenians".[5]