The United States is accusing Islamic State militants of using civilians as human shields as Iraqi forces move closer to the group's stronghold in Mosul.
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700,000 people are believed to remain in the city, where up to 5,000 IS fighters are facing a third day of the operation to retake it.
Government troops are moving up from the south while their Kurdish allies are approaching from the east in a campaign which began on Monday.
The US has also raised fears that the terror group could use chemical weapons as it tries to repel the offensive.
