Authorities say the suspect, Paddock, was discovered dead in his room at the Mandalay Bay hotel, and that he acted alone.

"We're going to see some of the folks that are recovering, some of the survivors", Trump said ahead of the trip.

Netizens also noticed that even before releasing the name of the gunman, police and the media released the name of an Asian 'person of interest, ' who was Paddock's roommate but was later on cleared for being out of the country when the shooting happened.

He said the guard became separated from the officers somehow and Paddock shot him through his hotel door.

Police are still examining the devices and are unsure if they recorded Paddock's rampage as he rained fire from the 32nd floor window of his room at the Mandalay Bay Resort and Casino. The bullets peppered a crowd of 22,000 people, leaving at least 59 dead.

Sheriff Joseph Lombardo from the Las Vegas Metropolitan Police Department told reporters that Paddock as 'lone wolf'. But, he said, "we'll be back". She reportedly left the United States on September 25 and has been located in the Philippines, where she was born.

In a brief statement at a news conference Monday morning, FBI special agent Aaron Rouse said the bureau had "determined to this point no connection of an worldwide terrorist group".

An officer can be heard shouting "Everyone stay down!" He said he originally planned on leaving Las Vegas on Sunday, but chose to stay an extra day to enjoy the last night of the three-day concert.

Paddock had checked into the hotel room on Thursday, authorities said.

Whatever his motive, authorities said he planned the murderous attack in great detail, not only stockpiling almost two dozen guns in his hotel room but setting up cameras in the peephole and on a service cart outside his door, apparently to watch for police coming for him. Officials said a search warrant was executed at another home Paddock owned in Reno.

"Nobody wants answers to why more than the police and the victims' families, but we have a responsibility to get it right", McMahill said.

But additional information obtained by investigators revealed the extent to which Paddock apparently "pre-planned extensively" for the attack, Lombardo said.

Eric Paddock told the Daily Mail that he was "dumbfounded" and "shocked" by the news of his brother's massacre. He said the family is "horrified and bewildered".

"There's no political affiliation that we know of".

However, a senior USA homeland security official speaking on condition of anonymity told Reuters there was "no evidence" Paddock had "mental illness or brain damage".