The masked jihadi who led the executions of 21 Egyptian Christians in Libya over the weekend could be an American recruited by ISIS, a US official told The Post on Wednesday.

Intelligence experts are currently analyzing the facial features and speech patterns of the unidentified extremist seen in gruesome video released by the Islamic State on Sunday.

“They are analyzing the video now, using facial recognition and they continue to analyze his speech patterns,” said an official who requested to not be named. “He sounds American to me.”

Professor Erik Thomas — a linguistics expert at North Carolina State University — added that based on distinctive word pronunciations, he also believes the unidentified man in camouflage “sounds like an American” with some Arabic influence mixed in, according to ABC News.

Another expert, who asked not to be named, said the ISIS execution leader could be a native Arabic speaker who came to learn American English while spending a “significant amount of time” in the US.

By using someone from the US to lead the charge in the mass-beheading video, ISIS is ultimately attempting to spark nervousness and fear at home, the US official explained to The Post.

“We know they are trying to actively recruit Americans,” the official added. “By using somebody with a clear American voice, they assess that they will get into the minds of Americans, make them nervous and scared.”

There are currently 3,000 Westerners fighting in Syria and Iraq, the official says.

Around 150 of these converts are Americans who have set their sights on joining various terrorist organizations.

“They would love nothing more than to have one of these American converts fly back to the United states with an American passport to create terror and make you lose sleep at night,” the official warned.