On the night of 27 November 1980, four friends —Miguel Ángel San Martín Fernández, Carlos Fernández Valcárcel, Joaquín Martínez Simón and José Luis Hernández Hurtado— went to the “Chistera” bar in Logroño, which was frequented by members of the police force. At around 9.40 pm, as they were leaving the establishment, two terrorists from ETA militar remotely detonated a device consisting of explosives and shrapnel hidden in a rented car they had parked close to the bar. The only one of the four to survive the explosion was José Luis Hernández.
Miguel Ángel San Martín was a local textile shop-owner and had a small daughter. He was killed instantly by the blast.