LAS VEGAS, Nevada – A gunman killed at least 50 people and wounded more than 200 at a country music festival on the Las Vegas Strip on Sunday, raining down rapid fire from the 32nd floor of a hotel for several minutes before he was shot dead by police.

The death toll, which police emphasized was preliminary and tentative, 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.

Thousands of panicked people fled the scene, in some cases trampling one another as law enforcement officers scrambled to locate and kill the gunman. Shocked concert goers, some with blood on their clothes, wandered the streets after the attack.

Police identified the gunman as area resident Stephen Paddock, 64, but said they had no information yet about his motive.

He was not believed to be connected to any militant group, Clark County Sheriff Joseph Lombardo told reporters.

“We have no idea what his belief system was,” Lombardo said. “Right now, we believe he was the sole aggressor and the scene is static.”