Video: Islamic State group beheads US aid worker

22 PHOTOS
ISIS ISIL Islamic State beheadings and more Peter Kassig
See Gallery
Video: Islamic State group beheads US aid worker
WASHINGTON, DC - NOVEMBER 16: U.S. President Barack Obama returns to the White House on Marine One on November 16, 2014 in Washington, DC. Obama is returning from Brisbane, Australia where he attended the G20 Leader's Summit. (Photo by Dennis Brack-Pool/Getty Images)
"We are heartbroken to learn that our son has lost his life as a result of his love for the Syrian people." #Kassig http://t.co/5TbmxSs9Fk
Ed & Paula Kassig: "We are incredibly proud of our son for living his life according to his humanitarian calling." http://t.co/Iqm0lCBOY8
MISRATA, LIBYA - JUNE 02: In this handout image made available by the photographer American journalist Steven Sotloff (Center with black helmet) talks to Libyan rebels on the Al Dafniya front line, 25 km west of Misrata on June 02, 2011 in Misrata, Libya. Sotloff was kidnapped in August 2013 near Aleppo, Syria and was recently shown on a jihadist video in which fellow US journalist James Foley was executed. In the video the militant form the Islamic State (IS) threatens to kill Sotloff next if the US continues its aerial campaign against the insurgency. (Photo by Etienne de Malglaive via Getty Images)
Daily News front page Agusut 20, 2014, SAVAGES - ISIS monster behead U.S. journalist, taunt Obama over air strikes in Iraq - James Foley. (Photo By: /NY Daily News via Getty Images)
British hostage James Cantlie shown in "Lend Me Your Ears: Episode 2." (Clarion Project)
Cantlie rails against Obama's "simplistic" speeches and "under-construction" army. (Clarion Project)
ISIS also went to great efforts to cite American media both quoting the president and showing criticism of his strategies, in this case using a CNN article. (Clarion Project)
US President Barack Obama speaks during a primetime address to the nation from the Cross Hall of the White House in Washington, DC, September 10, 2014. AFP PHOTO / POOL / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
U.S. President Barack Obama speaks during a televised address at the White House in Washington, D.C., U.S., on Wednesday, Sept. 10, 2014. Obama pledged a relentless campaign to destroy Islamic State extremists in Iraq and Syria, with Middle Eastern allies such as Saudi Arabia and Jordan playing crucial supporting roles. Photographer: Saul Loeb/Pool via Bloomberg
U.S. President Barack Obama leaves after speaking during a televised address at the White House in Washington, D.C., U.S., on Wednesday, Sept. 10, 2014. Obama pledged a relentless campaign to destroy Islamic State extremists in Iraq and Syria, with Middle Eastern allies such as Saudi Arabia and Jordan playing crucial supporting roles. Photographer: Saul Loeb/Pool via Bloomberg
NEWPORT, WALES - SEPTEMBER 04: US President Barack Obama (L) meets with British Prime Minister David Cameron at the NATO Summit on September 4, 2014 in Newport, Wales. Leaders and senior ministers from around 60 countries are meeting at what has been billed as the most important Nato summit since the end of the cold war with the situation in Ukraine and the threat of ISIS likely to be top of the agenda. (Photo by Peter Macdiarmid - WPA Pool /Getty Images)
NEWPORT, WALES - SEPTEMBER 04: (L-R) British Prime Minister David Cameron, NATO Secretary General Anders Fogh Rasmussen and US President Barack Obama talk as they arrive at the NATO Summit on September 4, 2014 in Newport, Wales. Leaders and senior ministers from around 60 countries are gathering for the two day meeting where Ukraine and the ISIS hostages are likely to be discussed. (Photo by Chris Ratcliffe - Pool/Getty Images)
NEWPORT, WALES - SEPTEMBER 04: British Prime Minister David Cameron gestures to US President Barack Obama as they arrive at the NATO Summit on September 4, 2014 in Newport, Wales. Leaders and senior ministers from around 60 countries are gathering for the two day meeting where Ukraine and the ISIS hostages are likely to be discussed. (Photo by Chris Ratcliffe - Pool/Getty Images)
Druze men stand in the Israeli-annexed Golan Heights as they look at smoke rising in the distance caused by fighting between forces loyal to Syrian President Bashar Assad and rebels over the control of the Quneitra border crossing, on August 27, 2014. Syrian rebels, including Al-Qaeda's affiliate Al-Nusra Front, seized control of the Syrian crossing with the Israeli-occupied Golan Heights today, the Britain-based Syrian Observatory for Human Rights said. AFP PHOTO / JACK GUEZ (Photo credit should read JACK GUEZ/AFP/Getty Images)
Members of United Nations Disengagement Observer Force Zone (UNDOF) use binoculars to watch smoke rising in the distance caused by fighting between forces loyal to Syrian President Bashar Assad and rebels over the control of the Quneitra border crossing, on August 27, 2014. Syrian rebels, including Al-Qaeda's affiliate Al-Nusra Front, seized control of the Syrian crossing with the Israeli-occupied Golan Heights today, the Britain-based Syrian Observatory for Human Rights said. AFP PHOTO / JACK GUEZ (Photo credit should read JACK GUEZ/AFP/Getty Images)
A rebel fightercarries homemade mortar rounds on September 3, 2013 in the northern Syrian city of Raqqa. UN leader Ban Ki-moon said on September 3, 2013 that a military strike on Syria over the use of chemical weapons could worsen the country's conflict. AFP PHOTO / MEZAR MATAR (Photo credit should read MEZAR MATAR/AFP/Getty Images)
Displaced Iraqis from the Yazidi community cross the Iraqi-Syrian border along the Fishkhabur bridge over Tigris River at the Fishkhabur crossing, in northern Iraq, on August 11, 2014. At least 20,000 civilians, many of whom are from the Yazidi community, who had been besieged by jihadists on a mountain in northern Iraq have safely escaped to Syria and been escorted by Kurdish forces back into Iraq, officials said. The breakthrough coincided with US air raids on Islamic State fighters in the Sinjar area of northwestern Iraq on August 9, and Kurdish forces from Iraq, Syria and Turkey working together to break the siege of Mount Sinjar and rescue the displaced. AFP PHOTO/AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
Peshmerga forces hand out water bottles and show the way to displaced Iraqi families from the Yazidi community as they cross the Iraqi-Syrian border at the Fishkhabur crossing, in northern Iraq, on August 11, 2014. At least 20,000 civilians, most of whom are from the Yazidi community, who had been besieged by jihadists on a mountain in northern Iraq have safely escaped to Syria and been escorted by Kurdish forces back into Iraq, officials said. The breakthrough coincided with US air raids on Islamic State fighters in the Sinjar area of northwestern Iraq on August 9, and Kurdish forces from Iraq, Syria and Turkey working together to break the siege of Mount Sinjar and rescue the displaced. AFP PHOTO/AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)
Kurdish Peshmerga fighters hold a position on the front line in the Gwer district, 40 kilometres south of Arbil, the capital of the Kurdish autonomous region in northern Iraq, on September 18, 2014. France said that it will follow the United States in launching air strikes against the Islamic State group in Iraq, as the jihadists posted their latest video of a Western hostage. AFP PHOTO / SAFIN HAMED (Photo credit should read SAFIN HAMED/AFP/Getty Images)
Kurdish Peshmerga fighters hold a position on the front line in the Gwer district, 40 kilometres south of Arbil, the capital of the Kurdish autonomous region in northern Iraq, on September 18, 2014. France said that it will follow the United States in launching air strikes against the Islamic State group in Iraq, as the jihadists posted their latest video of a Western hostage. AFP PHOTO / SAFIN HAMED (Photo credit should read SAFIN HAMED/AFP/Getty Images)
HIDE CAPTION
SHOW CAPTION
of
SEE ALL
BACK TO SLIDE

BEIRUT (AP) - An Islamic State group video released Sunday purports to show extremists beheading a dozen Syrian soldiers and ends with a militant claiming to have killed U.S. aid worker Peter Kassig, the latest slaughter proudly broadcast by the group on the Internet.

The video ends with the militant standing over a severed head he says belongs to Kassig. U.S. officials said they were working to determine the video's authenticity. Kassig's family said it was awaiting the outcome of the investigation.

"We prefer our son is written about and remembered for his important work and the love he shared with friends and family, not in the manner the hostage takers would use to manipulate Americans and further their cause," the family said in a statement.

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.

The video identifies the militants' location as Dabiq, a town in northern Syria that the militant group 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 shows the beheadings of about a dozen men identified as Syrian military officers and pilots, all dressed in blue jumpsuits. The main militant in the video who speaks to the camera has a British accent and 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 group in airstrikes, supporting Western-backed Syrian rebels, Kurdish fighters and the Iraqi military.

The militant's voice is distorted in the video. Previous videos featured a militant with a British accent that the FBI says it has identified, though it hasn't named him publicly.

Later, the militant claims Kassig, 26, was killed because he "fought against the Muslims in Iraq while serving as a soldier." Kassig, from Indianapolis, Indiana, served in the U.S. Army's 75th Ranger Regiment, a special operations unit, and deployed to Iraq in 2007.

After being medically discharged, Kassig formed the aid organization Special Emergency Response and Assistance, or SERA, in Turkey to aid Syrian refugees. He delivered food and medical supplies and provided trauma care to wounded Syrian civilians before being captured in eastern Syria last year. Friends say he converted to Islam in captivity and took the first name Abdul-Rahman.

Burhan Agha, a Syrian friend who worked with Kassig in Lebanon and who moved to Switzerland seeking asylum, wept when recounting his generosity Sunday.

"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 AP by telephone. "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."

The White House said the U.S. intelligence community was examining the video. National Security Council spokeswoman Bernadette Meehan said that if the video is authentic, the White House would be "appalled by the brutal murder of an innocent American." British Prime Minister David Cameron said he was "horrified by the cold-blooded murder," saying that the Islamic State group has "again shown their depravity."

ISIS Purportedly Beheads American Peter Kassig

Previous videos have shown the beheading of two American journalists and two British aid workers. The latest video did not show the person identified as Kassig being beheaded. Unlike previous videos, it did not show other Western captives or directly threaten to behead anyone else. It also had lingering close-ups on some miltiants' exposed faces, with a few appearing to be foreigners.

The Islamic State group holds British photojournalist John Cantlie, who has appeared in several videos delivering statements for the group, likely under duress. They also hold 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.

The Islamic State group has beheaded and shot dead hundreds of captives - mainly Syrian and Iraqi soldiers - during its sweep across the two countries, and has celebrated its mass killings in extremely graphic videos.

The group has declared a self-styled Islamic caliphate in the areas under its control, which it governs according to its violent interpretation of Shariah law.

On Sunday, the Islamic State group claimed a bombing at the Baghdad International Airport that wounded five people, saying it was trying to strike Americans there. No one was wounded in a passing United Nations convoy, the organization said.

The Islamic State group has its roots in al-Qaida's Iraqi affiliate but was expelled from the global terror network over its brutal tactics and refusal to obey orders to confine its activities to Iraq. It became even more extreme amid the bloody civil war in neighboring Syria and grew strong enough to launch a lightning offensive across Iraq.

Syria's war began as an uprising against President Bashar Assad. Activists say that conflict has killed more than 200,000 people.

More from AOL.com:
Iraq's forces drive IS militants from key town
Obama: 'Strong week for American leadership'
Obama: Troop deployments depend on circumstances
US military chief says battle with ISIS starting to turn

Read Full Story

Sign up for Breaking News by AOL to get the latest breaking news alerts and updates delivered straight to your inbox.

Subscribe to our other newsletters

Emails may offer personalized content or ads. Learn more. You may unsubscribe any time.