<P> At a press conference on October 4, Sheriff Lombardo stated there was evidence--which he declined to discuss--that Paddock intended to escape the scene, and that he may have had assistance from an accomplice . Investigators searched Paddock's room and found a bulletproof vest and breathing apparatus, which were survival gear that Paddock never used . </P> <P> During subsequent investigations, ammonium nitrate, which is often used in improvised explosive devices, was found in the trunk of his Hyundai Tucson SUV, along with 1,600 rounds of ammunition and 50 pounds (23 kg) of Tannerite, a binary explosive used to make explosive targets for gun ranges . Undersheriff Kevin McMahill said that while Paddock had "nefarious intent" with the material, he did not appear to have assembled an explosive device . </P> <P> The mass shooting occurred between 10: 05 and 10: 15 p.m. PDT on October 1, 2017, which was the third and final night of the festival . When the shooting began, country music singer Jason Aldean was giving the closing performance before an audience of about 22,000 . </P> <P> Shortly before 10 p.m., hotel security guard Jesus Campos was sent to the 32nd floor to investigate an open - door alert . He encountered a barricaded door that prevented him from immediately accessing the floor . After arriving on the floor, he heard drilling from Paddock's room and went to investigate . At approximately 10: 05 he was hit in the right thigh by one of about 200 bullets which Paddock fired through his suite's door . Campos was hit in the right thigh and immediately informed the hotel by radio and cellphone that he had been shot . At the same time, maintenance worker Stephen Schuck was on the same floor to check out a report about a jammed fire door . Campos, who was already injured, encountered Schuck and told him to take cover . Schuck contacted hotel dispatchers over his radio, informed them of the ongoing shooting, and told them to call the police . Neither Las Vegas Metropolitan Police Department nor MGM Resorts International, the Mandalay Bay's owner, have confirmed when information about the initial shooting was relayed to the police . </P>

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