[custom_adv] The suspect in the deadliest mass shooting in modern American history has been identified as Stephen Paddock, authorities said. [custom_adv] Paddock, 64, is from Mesquite, Nev., about 80 miles northeast of Las Vegas and had been known to local law enforcement. [custom_adv] The shooting is not believed to be connected to terrorism, NBC News has learned. More than 50 people were killed when Paddock opened fire into an outdoor country music festival from the 32nd floor of Las Vegas' Mandalay Bay Resort and Casino on Sunday night, police said [custom_adv] Sheriff Joseph Lombardo told reporters in a news conference that more than 200 people had been injured. [custom_adv] Police responded to reports of the shooting just after 10 p.m. (1 a.m. ET), and later killed the suspected gunman — a local resident — in the Mandalay Bay Resort, he added. [custom_adv] Officials were searching for a woman they identified as Marilou Danley, who they identified as an Asian female traveling with the unnamed suspect, said Lombardo. Police described the woman as Paddock's companion [custom_adv] Authorities described having found several weapons in Paddock's hotel room after the shooting. [custom_adv] At least 50 people were killed and more than 200 wounded when a gunman opened fire on an outdoor music festival on the Las Vegas Strip in the worst mass shooting in modern U.S. history. [custom_adv] Authorities have identified the suspected gunman in the Sunday night shooting as Stephen Paddock. Clark County Sheriff Joseph Lombardo said officers confronted Paddock on the 32nd floor of the Mandalay Bay Hotel and Casino across the street from the concert. Paddock is dead. [custom_adv] Previously, the deadliest mass shooting had been an attack at an Orlando, Florida, nightclub that killed 49. Before that, the deadliest shooting in the U.S. was the 2007 attack at Virginia Tech, in which a student killed 32 people before killing himself. [custom_adv] The death toll, which police emphasized was preliminary, would make the attack the deadliest mass shooting in U.S. history, eclipsing last year's massacre of 49 people at an Orlando night club. [custom_adv] Some 22,000 people were in the crowd when the man opened fire, sending panicked people fleeing the scene, in some cases trampling one another, as law enforcement officers scrambled to locate and kill the gunman. Shocked concertgoers, some with blood on their clothes, wandered the streets after the attack. [custom_adv] At least 406 people were taken to area hospitals with injuries, Las Vegas Metropolitan Police said.