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Attorney General Eric Holder says the U.S. government is "working on" ways to capture or kill the man known as "Jihadi John," an Islamic State extremist who has appeared in several hostage-beheading videos.

Reports Thursday revealed the masked "Jihadi John" to be Mohammed Emwazi, a west London man who had been detained by counterterror officials in Britain at least once, in 2010.

"The vow that I can make to the American people, along with our allies, is that we will hold accountable all of the people who have been responsible for these heinous, barbaric acts," Holder told ABC News in an interview. "That is something that we are focused on each and every day."

Holder would not confirm reports identifying Emwazi as the ISIS militant. He insisted that nothing would be "served" by outing him.

But Holder did note that the government has been "thinking about" and "working on" ways to either kill or capture "Jihadi John."

"I think there is something to be said for holding accountable [and] getting at the people who are responsible for these barbaric acts," Holder told ABC News.

The Washington Post first reported Emwazi was the likely ISIS propagandist on Thursday, citing friends and human rights workers familiar with the case. Two U.S. government sources who spoke to Reuters Thursday confirmed that investigators believe the man is Emwazi.

Sky News obtained an exclusive photo of Emwazi -- with a goatee beard and wearing a Pittsburgh Pirates baseball cap -- from when he was a student at the University of Westminster in London.

According to The Washington Post and the BBC, Emwazi was born in Kuwait and studied computer programming at the University of Westminster. The university confirmed that a student of that name graduated in 2009.

"If these allegations are true, we are shocked and sickened by the news," the university said in a statement.

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Holder says US 'working on' how to capture or kill 'Jihadi John'