The FBI said Monday the deadly mass shooting in Las Vegas had no connection with an international terrorist group.

"We have determined, to this point, no connection with an international terrorist group," an FBI special agent said Monday. "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."

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At least 59 people are dead and hundreds are injured after a gunman opened fire at a country music festival in Las Vegas.

The suspected gunman was identified as Stephen Paddock, a Nevada resident. He was found dead in his hotel room.

President Trump on Monday called the mass shooting an "act of pure evil" and announced he would visit the grief-stricken city later this week.

“We join together in sadness, shock and grief,” Trump said at the White House. “It was an act of pure evil.”

Earlier on Monday, reports emerged that the Islamic State of Iraq and Syria had claimed responsibility for the attack, without providing evidence to support the claim.