A GOP lawmaker on Thursday night disputed local and federal investigators’ claim that October’s Las Vegas shooting was not a terrorist incident.

“I smell a rat like a lot of Americans. Nothing’s adding up," Rep. Scott Perry Scott Gordon PerryOn The Trail: How Nancy Pelosi could improbably become president GOP lawmaker: Systemic racism doesn't exist and there's 'more to the story' of Floyd's death We're united in an effort to end the FDA's dog testing mandate MORE (R-Pa.) said on Fox News's “Tucker Carlson Tonight.”

"It’s been four months, as you said, the man’s dead, they said he’s a lone gunman, lone shooter, yet we can’t get the autopsy results,” Perry continued.

“But even more troubling than that, I’ve been made aware of what I believe to be credible evidence, credible information, regarding terrorist infiltration through the southern border regarding this incident,” he said.

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Perry did not share what information he was privy to, but said the Islamic State in Iraq and Syria (ISIS) warned multiple times last year it would attack Las Vegas, then took credit for the attack.

Investigators said gunman Stephen Paddock on Oct. 1 opened fire from his Mandalay Bay hotel room on a country music festival taking place below on the Las Vegas strip, killing 58 people and injuring hundreds more.

Details about Paddock’s motive have been scarce, as the gunman killed himself during the incident.

However, the FBI ruled out any terrorist connection, and experts said they were puzzled by ISIS’s claims of responsibility for the attack.

Sometimes, experts said, the terrorist group will take credit for attacks it did not carry out or decline to take ownership for attacks it is linked to.

However, Perry said he did not believe local law enforcement’s declaration that Paddock acted alone, insisting “something’s not adding up.”

The Hill has reached out to Perry's office for comment.