Gunman Stephen Paddock, 64, opened fire on festivalgoers from his hotel room on the 32nd floor of the Mandalay Hotel at about 10.08pm local time last night.
Las Vegas police are urging Americans to donate blood for victims fighting for their lives after Paddock shot into the crowd of more than 22,000 people.
Clark County Sheriff Joe Lombardo has issued a public appeal for blood donors saying the mass casualty had led to a “need for blood” to keep wounded patients alive.
He said: “United Blood Services have their services set up currently. They are receiving patients or donors at 6930 West Charleston and 601 Whitney Ranch in Henderson.
“If you have the ability to donate blood to help us, please do so.”
Queues of people waiting to give blood have already formed outside many United Blood Services (UBS) centres across the state of Nevada.
Bridget Bennett, from the UBS on West Charleston, tweeted: “It’s 6:40 am, and there is a line out the door and around the block. People waiting to donate blood at United Blood Services.”
Meanwhile, KTNV reporter Yasmeen Hassan tweeted: ”The line to donate blood is out the door at United Blood Service. People have been here all night waiting for it to open.”
You can donate blood to Las Vegas shooting victims at the following UBS locations:
Las Vegas: 6930 West Charleston Boulevard, Las Vegas, Nevada, 89117
Las Vegas: 4950 West Craig Road, Las Vegas, Nevada, 89130
Carson City: 256 East Winnie Lane, Carson Cit, Nevada, 89706
Henderson: 601 Whitney Ranch Drive Building D Ste 20, Henderson, Nevada, 89014
Reno: 1125 Terminal Way, Reno, Nevada, 89502
Sparks: 4670 Sparks Boulevard, Suite 100, Sparks, Nevada , 89436
Worried families, who have lost contact with family or friends who were at the festival, are encouraged to contact Las Vegas Police.
Mr Lombardo said: “Family reunification is still taking place here at the Las Vegas Metropolitan Police Department Headquarters, so any individuals who are looking for answers for the family members of friends are welcome to come here and we will provide that information as we get there.”
Anyone who cannot travel to the police HQ in person should contact the Coroner’s office on: 1 866 535 5654