 On 10 July 1976, policemen surrounded and entered a printing house in the San Andrés suburb of Buenos Aires in an effort to free Vicecomodore Roberto Echegoyen from the Argentine air force, but the alerted guerrillas shot their hostage in the head.On 19 July, Montoneros killed Brigadier-General Carlos Omar Actis (tasked with overseeing the World Cup soccer championships in Argentina in 1978) in the suburb of Wilde in Buenos Aires.On 26 July Montoneros guerrillas operating in the San Justo suburb of Buenos Aires shot and killed an off-duty policeman, Ramón Emilio Reno in the presence of his 13-year-old brother.