An Iraqi insurgent group says it shot down a commercial helicopter that crashed near Baghdad on Thursday - and that it shot dead the only survivor.
Only one person survived the crash
The Islamic Army posted a video on the internet purporting to show the wreckage, and the shooting.
Eleven people died in the crash - six US security contractors, three Bulgarian crew and two Fijian guards.
A statement said the survivor was shot in revenge for "the murder of Muslims in the mosques of Falluja".
US and Bulgarian officials have confirmed the helicopter was lost about 20km (12 miles) north of the Iraqi capital on Thursday.
MAJOR AIRCRAFT LOSSES IN IRAQ
2 Nov 03: US Chinook helicopter shot down near Falluja, killing 16
9 Nov 03: US Black Hawk helicopter comes down near Tikrit, killing six
15 Nov 03: Two Black Hawks collide while trying to avoid ground fire in Mosul, killing 17
8 Jan 04: Black Hawk shot down near Falluja, killing nine
26 Jan 05: US Super Stallion in bad weather near the Jordanian border, killing 31
30 Jan 05: RAF Hercules transport plane comes down near Baghdad, killing 10
They said the Bulgarian Mi-8 helicopter was brought down by a rocket-propelled grenade.
It is believed to be the first time a civilian aircraft has been shot down over Iraq since the US-led invasion.
However, insurgents have shot down several US military helicopters.
In the video posted on the internet, it appears the amateur cameraman is running towards the scene of the crash, where wreckage is seen burning.
There is no verification of the video's authenticity.
The cameraman focuses on two bodies. One appears to be dead and is badly charred.
The second person, wearing a blue flight suit, is alive but badly hurt.
The cameraman orders him to stand up, but the survivor says he has a broken leg and asks for help.
The militants appear to help him up, and tell him to run away.
Then they shoot him at point blank range and he collapses.
They continue to shoot the body, shouting "Allahu Akbar" (God is Great).
A statement on the internet accompanying the video read: "The Islamic Army in Iraq claims responsibility for bringing down a... cargo aircraft and killing all those on board."
It said the killing was revenge for the murder of Muslims in Falluja - an apparent reference to a video showing a US soldier shooting dead a wounded Iraqi in a mosque in November.