They said she had shamed herself and her family when she failed to return home one night. Some reports suggested she had converted to Islam to be closer to her boyfriend.Miss Aswad had taken shelter in the house of a Yezidi tribal leader in Bashika, a predominantly Kurdish town near the northern capital, Mosul.
A large crowd watched as eight or nine men stormed the house and dragged Miss Aswad into the street. There they hurled stones at her for half an hour until she was dead.
The stoning happened last month, but only came to light yesterday with the release of the Internet video.
It is feared her death has already triggered a retaliatory attack. Last week 23 Yezidi workmen were forced off a bus travelling from Mosulto Bashika by a group of Sunni gunmen and summarily shot dead.
An Amnesty International spokesman in London said they receive frequent reports of honour crimes from Iraq – particularly in the predominantly Kurdish north.
Most victims are women and girls who are considered by male relatives to have shamed their families by immoral behaviour.
Kurdish authorities have introduced reforms outlawing honour killings, but have failed to investigate them or prosecute suspects, added the Amnesty spokesman.
Kate Allen, the organisation’s UK director, said: "This young girl’s murder is truly abhorrent and her killers must be brought to justice.
"Unless the authorities respond vigorously to this and any other reports of crimes in the name of 'honour', we must fear for the future of women in Iraq."
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