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CAIRO — An Internet video released Friday purports to show an Islamic State in Iraq and Al-Sham (ISIS fighter beheading British hostage Alan Henning and threatening yet another American captive, the fourth such killing carried out by the extremist group now targeted in U.S.-led airstrikes.

The video mirrored other beheading videos shot by ISIS, which now holds territory along the border of Syria and Iraq. It ended with an ISIS fighter threatening a man they identified as an American named Peter Kassig.

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tap here to see other videos from our team. Try refreshing your browser, or British hostage Alan Henning purportedly beheaded by ISIS Back to video

Two U.S. officials, who spoke on condition of anonymity out of concerns of not having permission to release the information, confirmed that Peter Kassig is being held by ISIS militants. The officials declined to elaborate.

“Obama, you have started your aerial bombardment of Shams (Syria), which keeps on striking our people, so it is only right that we continue to strike the neck of your people,” the masked militant in the video said.