- 50 people were killed, more than 400 injured in deadliest mass shooting in modern American history.
- Gunman identified as Stephen Paddock, a 64-year-old man from Mesquite, Nevada.
- At least 10 weapons were found inside Paddock's room at the Mandalay Bay Resort and Casino.
- President Donald Trump is monitoring the developments, the White House said.
Police responded to reports of the shooting just after 10 p.m. (1 a.m. ET). Las Vegas Metropolitan Police Sheriff Joseph Lombardo told reporters Monday morning that authorities believe Paddock killed himself before police entered his room.
Earlier, officials had said police fatally shot Paddock.
The suspect is believed to have checked into the Mandalay Bay Resort and Casino on Sept. 28, Lombardo said, and had an "excess of ten rifles" in his hotel room.