 That same day, they killed three policemen in another ambush by urban guerrillas in Buenos Aires, and an army conscript in Tucumán province was reported to have been killed in action.On 5 March 1975, a Montoneros bomb detonated in the underground parking at Plaza Colón of the Argentine Army High Command; a garbage truck driver (Alberto Blas García) was killed and 28 others were wounded, including four colonels and 18 other ranks.In early June 1975, Montoneros guerrillas murdered executives David Bargut and Raul Amelong of the Acindar steel firm in Rosario, in reprisal for alleged repression against striking employees.