FBI investigators say they have found no links between the Las Vegas massacre and international terrorist groups after Isis claimed responsibility for the deadliest mass shooting in American history.

In a brief statement, FBI special agent Aaron Rouse said the bureau had "determined to this point no connection of an international terrorist group".

At least 58 people were killed and more than 500 injured after Stephen Paddock fired into a crowd of concert-goers late on Sunday.

Isis claimed a “soldier of the Islamic State” was behind the killing.

But Mr Rouse, a former counter-intelligence chief, who is the lead agent in charge of the Las Vegas district, appeared to dismiss this claim, saying there was no evidence of any link to the Islamist group.

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

His comments come at an early point in the investigation and do not preclude detectives finding a link to international terror groups later in the probe.

Las Vegas shooting – in pictures Show all 15 1 /15 Las Vegas shooting – in pictures Las Vegas shooting – in pictures People scramble for shelter at the Route 91 Harvest country music festival after gun fire was heard Getty Las Vegas shooting – in pictures People carry a person at the Route 91 Harvest country music festival after shots were fired David Becker/Getty Las Vegas shooting – in pictures People run from the Route 91 Harvest country music festival after gun fire was heard David Becker/Getty Las Vegas shooting – in pictures A handout photo released via Twitter by Eiki Hrafnsson (@EirikurH) showing concertgoers running away from the scene (C) after shots range out at the Route 91 Harvest festival on Las Vegas Boulevard EPA/Eiki Hrafnsson Las Vegas shooting – in pictures People lie on the ground at the Route 91 Harvest country music festival after hearing gun fire Getty Las Vegas shooting – in pictures A man in a wheelchair is taken away from the Route 91 Harvest country music festival after hearing gun fire David Becker/Getty Las Vegas shooting – in pictures People stand on the street outside the Mandalay Bay hotel near the scene of the Route 91 Harvest festival on Las Vegas Boulevard EPA/Paul Buck Las Vegas shooting – in pictures FBI agents confer in front of the Tropicana hotel-casino after a mass shooting during a music festival on the Las Vegas Strip Reuters/Las Vegas Sun/Steve Marcus Las Vegas shooting – in pictures Las Vegas police run by a banner on the fence at the Route 91 Harvest country music festival grounds after shots were fired David Becker/Getty Las Vegas shooting – in pictures An injured person is tended to in the intersection of Tropicana Ave. and Las Vegas Boulevard after a mass shooting at a country music festival Ethan Miller/Getty Las Vegas shooting – in pictures Metro Police officers pass by the front of the Tropicana hotel-casino after a mass shooting at a music festival on the Las Vegas Strip Reuters/Las Vegas Sun/Steve Marcus Las Vegas shooting – in pictures A woman sits on a curb at the scene of a shooting outside of a music festival along the Las Vegas Strip AP/John Locher Las Vegas shooting – in pictures A cowboy hat lays in the street after shots were fired near a country music festival in Las Vegas Getty Las Vegas shooting – in pictures Las Vegas Metro Police and medical workers stage in the intersection of Tropicana Avenue and Las Vegas Boulevard South after a mass shooting at a music festival on the Las Vegas Strip Reuters/Las Vegas Sun/Steve Marcus Las Vegas shooting – in pictures Sheriff Joe Lombardo (2-R) speaking during a press briefing in the aftermath of the active shooter incident on Las Vegas Boulevard EPA

The CIA is also advising caution on "jumping to conclusions" after Isis said it was linked to the attack, with agency spokesman Jonathan Liu saying US intelligence agencies are aware of the claim.

He said people shouldn't rush to judgment "before the facts are in”.

The probe quickly moved from Las Vegas’ famous strip of hotels and casinos to a retirement home in the small desert town of Mesquite.