Images of Iranian air strikes in eastern Iraq have provided the first concrete evidence of direct involvement by the Iranian air force in the military campaign against Isis.
The US military believes that Iran has conducted air strikes against Isis targets in Diyala province in recent days, although the Pentagon insists that it is not co-ordinating any military action with Tehran.
The Iranian air strikes, which involved four decade-old aircraft that originally came from the US, underlines the potentially precarious environment in Iraq with two militaries that barely talk to each other attacking the same enemy.
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