Iraq forces preparing for Fallujah battle: PM spokesman

He did not say when an assault on the jihadist bastion would begin.

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Iraqi forces have in recent days been massing around Fallujah, a city just 50 kilometres west of Baghdad and which has been out of government control since January 2014.

Fallujah and Mosul, the capital of the northern province of Nineveh, are the last two major cities IS still holds in Iraq.

Fallujah is almost completely surrounded by Iraqi forces who have regained significant ground in the Anbar province in recent months, including its capital Ramadi further up the Euphrates River valley.