What we’ve learned in 2 months since Las Vegas shooting Staff Report, Las Vegas Review-Journal · December 1, 2017 at 4:00 pm About a week after the Las Vegas mass shooting, Clark County Sheriff Joe Lombardo told the Las Vegas Review-Journal he was frustrated. Why? Investigators had yet to determine what drove the Mandalay Bay gunman to open fire on innocent concertgoers the night of Oct. 1 “I think there needs to be some closure for myself, for the Police Department and the public,” the sheriff said at the time. Yet two months after the shooting, many questions remain. Investigation: Knowns, unknowns We know the gunfire first started falling on the Route 91 Harvest festival crowd about 10:05 p.m. But everything that happened in the moments prior is still fuzzy.