From The Australian:
AN Iraqi soldier on foot patrol with US forces in the northern city of Mosul shot and killed two American soldiers and wounded six more, the worst such case yet of US-trained local troops turning their guns on their allies.
The Iraqi soldier, identified as Barzan al-Hadidi, was part of a joint daytime patrol on the streets of the dangerous city, considered to be one of the last strongholds of Al-Qa'ida and its local allies in Iraq. He was quickly gunned down by other members of the patrol, officials said.
The Iraqi Interior Ministry said the soldier opened fire after he had been publicly slapped by an American colleague. Many Iraqi men, especially in the military, are intensely proud and conscious of any perceived slight to their honour.
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My Comment: There could be more to this story than what we know .... or it was simply a soldier losing his cool.