Finally, Borsellino was allowed to sit in when another magistrate questioned Mutolo. On July 16, 1992, Borsellino attended another deposition of Mutolo while he was frantically investigating the killing of his friend and colleague Giovanni Falcone. The next day Mutolo started to talk about the collusion between Cosa Nostra and high-level government officials. Two days later, on July 19, 1992, Borsellino and his escort of five police officers were killed in a car bomb in Palermo on the orders of Salvatore Riina and the Sicilian Mafia Commission.