A man who clams to be an “American jihadist” says Sunday’s terror attack in Texas was the work of ISIS and that “trained soldiers” are currently positioned in 15 states and planning more attacks.

The post on a file-sharing site was signed by Abu Ibrahim Al Ameriki, a man that intelligence sources admit joined a Pakistani terrorist group several years ago.  He has been seen in propaganda videos for ISIS in the past.

“Out of the 71 trained soldiers 23 have signed up for missions like Sunday, we are increasing in number,” read the warning. “Of the 15 states, 5 we will name… Virginia, Maryland, Illinois, California, and Michigan.”

The posting appeared to claim the attack at the Draw the Prophet Muhammad contest in Texas was successful despite the fact the attackers were shot dead by security at the event before they could reach anyone actually involved in the event.

The terrorist group posted a video Tuesday night with clips of praise for the two jihadists who committed the attempted assault on the contest.

The attack in Texas seems to back up comments earlier this year from FBI head James Comey who said they had reports of radicalized Americans in 49 states.

“We are focused keenly on who would be looking to travel to join this band of murderers who will have come back from Iraq and Syria and to the United States,” Comey said in a speech to law enforcement officers in Mississippi. “We have opened cases all over the place focused on this threat, so it is not … a Washington thing – it is something we focus on throughout the FBI.”