By September 1931, Maranzano realized Luciano was a threat, and hired Vincent "Mad Dog" Coll, an Irish gangster, to kill him. However, Lucchese alerted Luciano that he was marked for death. On September 10, Maranzano ordered Luciano, Genovese and Costello to come to his office at the 230 Park Avenue in Manhattan. Convinced that Maranzano planned to murder them, Luciano decided to act first. He sent to Maranzano's office four Jewish gangsters whose faces were unknown to Maranzano's people. They had been secured with the aid of Lansky and Siegel. Disguised as government agents, two of the gangsters disarmed Maranzano's bodyguards. The other two, aided by Lucchese who was there to point Maranzano out, stabbed the boss multiple times before shooting him. This assassination was the first of what would later be fabled as the "Night of the Sicilian Vespers."