Around 1500 Iraqi forces are taking part in the operation to drive ISIS from Mosul. (AFP photo)
Turkey has been locked in a row with Iraq's central government over the presence of Turkish troops at Bashiqa and over who should take part in the US-backed assault on Mosul.
"Around half of the 3,000 are currently taking part in the operation. The other half are being kept in reserve," one of the sources told Reuters.
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