A member of an anti-Islamic State Sunni force called Sahwa (Awakening) said an Iraqi fighter jet, a Russian-made Su-25, was seen in flames as it crashed after being shot down north of Ramadi.
Iraq's government relies on a US-led coalition and Iranian-backed Shi'ite militias in its fight against Islamic State, which holds a third of the country as well as parts of neighbouring Syria.
The Islamic State Twitter site said the fighter jet had been shot down as it conducted a raid on areas north of Ramadi, the provincial capital of Sunni heartland Anbar.
Islamic State militants seized Ramadi last month and the city is a focal point of efforts to slow the group's advances in Iraq, a major oil producer and OPEC member.

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