Beirut • The Islamic State has beheaded Peter Kassig, releasing a video Sunday showing a masked militant standing over the severed head of a man it said was the former U.S. Army Ranger-turned-aid worker, who was seized while delivering relief supplies in Syria last year.
President Barack Obama confirmed Kassig's slaying after a U.S. review of the video, which also showed the mass beheadings of a dozen Syrian soldiers.
Kassig, 26, who founded an aid group to help Syrians caught in their country's brutal civil war, "was taken from us in an act of pure evil by a terrorist group that the world rightly associates with inhumanity," Obama said in a statement.
He denounced the extremist group, which he said "revels in the slaughter of innocents, including Muslims, and is bent only on sowing death and destruction."
The slain hostage's parents, Ed and Paula Kassig, said they were "heartbroken" by their son's killing, but "incredibly proud" of his humanitarian work. Kassig "lost his life as a result of his love for the Syrian people and his desire to ease their suffering," the parents said in a statement from Indianapolis.
With Kassig's death, the Islamic State group has killed five Westerners it was holding. American journalists James Foley and Steven Sotloff were beheaded, as were British aid workers David Haines and Alan Henning.
Unlike previous videos of slain Western hostages, the footage released Sunday did not show the decapitation of Kassig or the moments leading up to his death.
"This is Peter Edward Kassig, a U.S. citizen ... who fought against the Muslims in Iraq," said the black-clad militant, who spoke with a British accent, which was distorted in the video, apparently to disguise his identity. Previous videos featured a militant with a British accent who the FBI says it has identified, though it hasn't named him publicly.
The footage released Sunday identifies the militants' location as Dabiq, a town in northern Syria, which the Islamic State uses as the title of its English-language propaganda magazine and where they believe an apocalyptic battle between Muslims and their enemies will occur.
The high-definition video also showed the beheadings of about a dozen men identified as Syrian military officers and pilots, all dressed in blue jumpsuits. The black-clad militant warns that U.S. soldiers will meet a similar fate.
"We say to you, Obama: You claim to have withdrawn from Iraq four years ago," the militant said. "Here you are: You have not withdrawn. Rather, you hid some of your forces behind your proxies."
A U.S.-led coalition is targeting the Islamic State in airstrikes and supporting Western-backed Syrian rebels, Kurdish fighters and the Iraqi military.
Kassig, who served in the U.S. Army's 75th Ranger Regiment, a special operations unit, deployed to Iraq in 2007. After being medically discharged, he returned to the Middle East in 2012 and formed a relief group, Special Emergency Response and Assistance, to aid Syrian refugees.
A certified EMT, Kassig had delivered food and medical supplies and provided trauma care to wounded Syrians before being captured in eastern Syria on Oct. 1, 2013. Friends say he converted to Islam in captivity and took the first name Abdul-Rahman.
In a statement issued as he flew back to Washington from the Asia-Pacific region, Obama said Kassig "was a humanitarian who worked to save the lives of Syrians injured and dispossessed" by war. The president offered prayers and condolences to Kassig's family.
"We cannot begin to imagine their anguish at this painful time," he said.
Burhan Agha, a Syrian who worked with Kassig in Lebanon, wept when recounting his friend's humanitarian work.
"If I could apologize to each American, one by one, I would, because Peter died in Syria, while he was helping the Syrian people," Agha told The Associated Press by telephone from Switzerland, where he is seeking asylum. "Those who killed him claimed to have done it in the name of Islam. I am a Muslim and am from Syria. ... [His killers] are not Muslims."
British Prime Minister David Cameron said he was "horrified by the cold-blooded murder," saying that the Islamic State group had "again shown their depravity."
The Islamic State group still holds other captives, including British photojournalist John Cantlie, who has appeared in several videos delivering statements for the group, likely under duress, and a 26-year-old American woman captured last year in Syria while working for aid groups. U.S. officials have asked that the woman not be identified out of fears for her safety.
FILE - In this August 2013 file photo provided by the Kassig Family, Peter Kissig, who friends and family say changed his name to Abdul-Rahman Kassig, right, works as a medic to help a wounded man near Deir Ezzor, Syria. A new graphic video purportedly produced by Islamic State militants in Syria released Sunday Nov. 16, 2014 claims U.S. aid worker Kassig was beheaded. (AP Photo/Courtesy Kassig Family, File)
This undated photo provided by the Kassig Family shows Peter Kassig delivering supplies for Syrian refugees. A new graphic video purportedly produced by Islamic State militants in Syria released Sunday Nov. 16, 2014 claims U.S. aid worker Kassig was beheaded. (AP Photo/Courtesy Kassig Family)
In this undated photo provided by the Kassig family, Peter Kassig, is shown with his maternal grandparents. His grandfather, a co-founder of Christians for Peace and Justice in the Middle East, was an advocate for Palestinians in their struggle for a homeland. The Islamic State group released a graphic video on Sunday, Nov. 16, 2014, in which a black-clad militant claimed to have beheaded U.S. aid worker Peter Kassig, who was providing medical aid to Syrians fleeing the civil war when he was captured inside Syria on Oct. 1, 2013. His friends say he converted to Islam in captivity and took the first name Abdul-Rahman. (AP Photo/Courtesy Kassig Family)
In this undated photo provided by the Kassig Family, Peter Kassig, is shown with an injured kitten, which was rescued and nursed back to health by Kassig and a friend. The Islamic State group released a graphic video on Sunday, Nov. 16, 2014, in which a black-clad militant claimed to have beheaded U.S. aid worker Peter Kassig, who was providing medical aid to Syrians fleeing the civil war when he was captured inside Syria on Oct. 1, 2013. His friends say he converted to Islam in captivity and took the first name Abdul-Rahman. (AP Photo/Courtesy Kassig Family)
This still image taken from an undated video published on the Internet by the Islamic State group militants and made available, Sunday, Nov. 16, 2014, purports to show extremists marching Syrian soldiers before beheading them. The high-definition video later shows the beheadings of about a dozen men identified as Syrian military officers and pilots, all dressed in blue jumpsuits. The Associated Press could not independently verify the footage, though it appeared on websites used in the past by the Islamic State group, which now controls a third of Syria and Iraq. (AP Photo)
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