Stephen Craig Paddock, 64, killed 59 people and injured more than 527

ISIS claimed he had converted and that he was a 'Soldier of Islamic State'

US officials say there is no evidence that Paddock was linked to ISIS

ISIS claims of responsibility for the mass shooting in Las Vegas where 59 people were killed and more than 527 wounded, and said the attacker had converted to Islam a few months ago have been disputed by the FBI.

Stephen Craig Paddock, 64, a resident of nearby Mesquite, Nevada, opened fire on a country music festival taking place at Las Vegas Village from a room across the street in the Mandalay Bay Hotel just after 10pm on Sunday evening.

ADVERTISEMENT

However, by Monday morning, FBI investigators had 'determined that there is NO connection between the Vegas shooter and ISIS or international terrorism,' according to NBC.

It came after the claim was disputed down by unnamed US officials, who said there is no evidence he was linked to ISIS. Paddock's family had earlier said he had no religious or political affiliations.

Claims: ISIS said in an earlier release that Paddock had 'converted to Islam a few months ago' and that he was a 'soldier of the Islamic State'

Not giving up: ISIS has continued to repeat repeating its claims that Stephen Paddock was a 'soldier of the caliphate' - despite denials from FBI, Nevada police and Paddock's family

'The Las Vegas attack was carried out by a soldier of the Islamic State and he carried it out in response to calls to target states of the coalition,' the group's news agency Amaq said in reference to the U.S.-led coalition fighting the group in the Middle East.

'The Las Vegas attacker converted to Islam a few months ago,' Amaq added.

Click here to resize this module

Two senior U.S. officials said shortly after ISIS's statement that there was no evidence that the shooter was tied to any international militant group.

One of the two U.S. officials discounted Islamic State's claim of responsibility and said there was reason to believe that the shooter had a history of psychological problems.

Later on, Special Agent Aaron Rouse of the FBI said in a statement that the bureau had 'determined to this point no connection to an international terrorist group.

'As this investigation continues, we will continue to work with our partner to ensure that this is factually, thoroughly and absolutely investigated, to be able to bring comfort and peace back to this community.'

In addition, Clark County Sheriff Joseph Lombardo said investigations are still ongoing and police have not yet determined a motive.

Paddock was not believed to be connected to any militant group, Lombardo said.

At least 50 people are dead and 200 injured after the Sunday shooting at the Las Vegas music festival

Three people lie on the ground, one covered in blood, after the shooting at the Route 91 Harvest country music festival on Sunday

A police officer takes cover behind a police vehicle during the shooting near the Mandalay Bay resort and casino

People take cover at the Route 91 Harvest country music festival

In an exclusive interview with Dailymail.com, the shooter's family said he had no political or religious affiliation.

'He was just a guy. Something happened, he snapped or something,' his brother Eric Paddock said from his home in Orlando, Florida

'He's my brother, we don't have a very close relationship but we talk occasionally. There's no rhyme or reason here, it makes no sense'.

'He has no political affiliation, no religious affiliation, as far as we know. This wasn't a terror attack'.

Paddock lived just 90 minutes outside Las Vegas in the city of Mesquite, with 62-year-old Marilou Danley, an Australian citizen believed to be of Indonesian descent.

Eric Paddock said of Ms Danley: 'She has nothing to do with this, at least from my perspective.

ADVERTISEMENT

Police said in a press conference early Monday that that they discovered in 'excess of 10 rifles' in the room, and that Paddock's death was the result of a self-inflicted gunshot wound.