"Jihadi John"
"Jihadi John" Reuters

United States forces are targeting the London man believed to be "Jihadi John," an Islamic State (ISIS) executioner, senior Democratic senator Dianne Feinstein said Sunday, according to AFP.

London graduate Mohammed Emwazi was unmasked by media this week as allegedly being the English-speaking executioner responsible for the beheading of at least five Western hostages held by ISIS in Syria and Iraq.

Asked whether the United States was "going after" Emwazi specifically, Feinstein responded affirmatively.

"Oh, yes. He's a target. There should be no question about that," the former Senate Intelligence Committee chair told CBS television's "Face the Nation."

The Kuwait-born computer expert, believed to be 26 or 27 years old, appeared for the first time in a video during the execution of American journalist James Foley in 2014.

He presided over numerous killings, and delivered English messages in execution videos.

Feinstein said Sunday that Emwazi's story of Western disaffection spoke to a "major problem" confronted by Western nations.

"What it tells us is that there are many young people, and you can see this by the number of tweets on Twitter, who are so disaffected," she said.

"Whether they feel rejected socially, whether they feel they don't have an opportunity, whether they feel this country is anti-Muslim, which it is not, I don't know."

On the weekend it was reported that Emwazi told a journalist in 2010 ago that surveillance by British security services had left him contemplating suicide.

On Sunday, reports emerged that Kuwaiti authorities are closely monitoring several of “Jihadi John’s” relatives who live and work in the Gulf emirate.

The reports did not say how many of Emwazi's relatives are in Kuwait. Authorities have remained silent on the issue.