A quick rundown of what you need to know about the Las Vegas shooting, the most deadly in U.S. history

On Sunday night, at least 58 people were killed and at least 515 others were injured in a mass shooting in Las Vegas.Police say the gunman, 64-year-old Stephen Paddock, of Mesquite, Nevada, was found dead in his room at the Mandalay Bay Hotel and Casino after the shooting.According to the associated press, the alleged gunman, a 64-year-old retiree, unleashed a hail of bullets from the 32 floor of the hotel on an outdoor country music festival below."What we are going to try to do as best we can