The White House said Monday that it is too early to say whether the deadly Las Vegas mass shooting amounts to an act of domestic terrorism.

"We're still in a fact-finding mission. This is an ongoing investigation," White House press secretary Sarah Huckabee Sanders told reporters when asked if President Trump believes the massacre was an act of domestic terrorism.

"And it would be premature to weigh in on something like that before we have any more facts," she said.

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Sanders said that determination would be left to local and federal law enforcement.

At least 58 people were killed and hundreds more were injured when a gunman opened fire at a country music festival in Las Vegas late Sunday.

The suspected gunman was identified as Stephen Paddock, a 64-year-old Mesquite, Nev., resident who was found dead in his hotel room overlooking the concert site.

President Trump on Monday condemned the mass shooting as an "act of pure evil" and said he would visit Las Vegas later this week.

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

The FBI said the shooting had no connection with an international terrorist group.