A short video released by ISIS on Friday shows the apparent beheading of British aid worker Alan Henning, with the executioner blaming the death on the United Kingdom for joining the U.S.-led bombing campaign against the group.
Henning is the fourth Westerner beheaded in an ISIS video. Like the others, the video shows and English-speaking, masked militant waving a knife over the kneeling hostage. Henning joined an aid convoy last December and was taken hostage soon after crossing from Turkey into Syria.
Prime Minister David Cameron calling Henning's executioners "barbaric and repulsive." President Obama said the U.S. and its allies will bring the perpetrators to justice.
The video is similar to the previous ones, with a clearly scripted statement being delivered by the victim. But unlike the previous ones, this one is shorter and is shot tightly, showing none of the surroundings.
And just like the previous videos, it ends with a threat to another hostage.
The National Security Council confirmed that Kassig is being held by ISIS.
"We will continue to use every tool at our disposal - military, diplomatic, law enforcement and intelligence - to try to bring Peter home to his family," according to agency spokeswoman Caitlin Hayden.
The American who appears at the end of the video, Kassig, is a former soldier who became an aid worker in the Middle East.
Kassig's parents, Ed and Paula, confirmed to CNN it was their son, "who was doing humanitarian work in Syria, is being held captive."
CNN's Arwa Damon profiled Kassig when he was helping wounded Syrians in Lebanon in June 2012. She's OutFront.