Two US soldiers have been shot dead by an Iraqi soldier outside the northern city of Mosul.
An Iraqi police lieutenant-colonel in Mosul said the man who shot the US soldiers was an Iraqi soldier who also acted as an imam at an Iraqi military training centre in Hamam al-Alil.
He said the US soldiers were doing exercises in the training centre's yard at the time of the attack. He did not know what had happened to the attacker afterwards.
Mosul and Nineveh are a last remaining bastion of al-Qaeda and about a dozen other Sunni Arab insurgent groups and the city is still rocked by frequent shootings and bombings.
Some of those insurgent groups have infiltrated Iraqi forces in the past.
US troops are due to withdraw from Iraqi cities by the end of June under a bilateral security pact but US officials say that, if the Iraqi government requests it, Mosul may be the sole exception.
