INTERNATIONAL NEWS UPDATE - The suspected gunman shot himself dead, say police.
What happened?
Some 22,000 people were attending a country music festival late on Sunday night in the open air by the Las Vegas strip.
The first shots rang out shortly after 22:00 local time (05:00 GMT).
The gunman fired from the 32nd floor of the Mandalay Bay Hotel before shooting himself dead. Earlier reports said he was killed by police.
Witnesses say hundreds of shots were fired and the sound of automatic gunfire was heard.
There was panic as people ran from the venue and tried to take cover.
Police said reports of other incidents at different locations along the Las Vegas strip were false.