ISIS is purportedly claiming that it has 71 trained soldiers in 15 states across America who are awaiting orders from the terror group.
The warning was posted on a file-sharing site and signed by Abu Ibrahim Al Ameriki, but it has not been verified.
The message named five specific states: Virginia, Maryland, Illinois, California, and Michigan.
Navy SEAL Rob O’Neill, who is credited with killing Usama bin Laden, said that ISIS is popular on social media and has a “glorified sense of resilience” because no one is fighting the terror group. He added that ISIS can claim responsibility for an attack just because they like it.
O’Neill also discussed last weekend’s attack on a Muhammad cartoon contest in Garland, Texas.
“This is a prime example of the difference between a gun-free zone and Texas […] These guys showed up because they were offended by something protected by the First Amendment and they were quickly introduced to the Second Amendment,” he said.
O’Neill said that the best way to protect yourself from attacks is to arm yourself.
UPDATE, 10a ET: Fox News chief intelligence correspondent Catherine Herridge reported the latest information on "America's Newsroom."
She said U.S. intelligence officials are assessing the credibility of the claim.
The question is whether the claim was made by a social media account linked to ISIS leadership or by an "opportunist" looking to capitalize on the Garland attack.
Herridge said the threat mentions Virginia, Illinois, Maryland, Michigan and California, claiming terrorists are ready to attack at a moment's notice.
The organizer of the cartoon event, Pam Geller, has also been called out as a target.