The push to drive I-S from Iraq hinges on re-taking the northern headquarters of its self-proclaimed caliphate.
Mosul fell to I-S in 2014, displacing half a million people.
It's home to another 1.5 million.
Tensions with Turkey amid coalition preparations to retake Mosul from IS
A US soldier guarding a position in northern Iraq. Source: AAP
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Preparations look to be underway for an Iraqi-led offensive to retake the city of Mosul from fighters of the so-called Islamic State.
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