Washington is considering direct talks with Iran on the security situation in Iraq, a US official has told the BBC.
一位美国官员透露，美国正在考虑与伊朗展开直接对话，商讨伊拉克的安全局势。
The move comes as US President Barack Obama weighs up（权衡） options on action to take in Iraq.
In the scenes, the soldiers are shown being led away and lying in
trenches4 before and after their "execution".
The Iraqi military said the pictures were real, but their
authenticity5（真实性） has not been independently confirmed.
The BBC's Jim Muir, in northern Iraq, says if the photographs are genuine, it would be by far the biggest single
atrocity6 since the time of the American-led invasion of Iraq in 2003.
Their
emergence7 came as the Iraqi government claimed to have "
regained8 the initiative" against an offensive by Sunni rebels led by ISIS - the Islamic State in Iraq and the Levant.
Extremists captured key cities, including Mosul and Tikrit, last week, but several towns have now been retaken from the rebels.
However the
insurgents9（叛乱分子） captured the northern city of Tal Afar, west of Mosul, overnight after a heavy
mortar10 bombardment.
The images appear to show captured Iraqi soldiers in
civilian11 clothes being led away by militants, as the BBC's John Simpson reports.
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