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An Iraqi Federal Police vehicle passes through a checkpoint in Qayara, some 31 miles, 50 km, south of Mosul, Iraq, Wednesday, Oct. 26, 2016. Islamic State militants have been going door to door in farming communities south of Mosul, ordering people at gunpoint to follow them north into the city and apparently using them as human shields as they retreat from Iraqi forces. Witnesses to the forced evacuation describe scenes of chaos as hundreds of people were driven north across the Ninevah plains and into the heavily-fortified city, where the extremists are believed to be preparing for a climactic showdown. (AP Photo/Marko Drobnjakovic)
An Iraqi Federal Police vehicle passes through a checkpoint in Qayara, some 31 miles, 50 km, south of Mosul, Iraq, Wednesday, Oct. 26, 2016. Islamic State militants have been going door to door in farming communities south of Mosul, ordering people at gunpoint to follow them north into the city and apparently using them as human shields as they retreat from Iraqi forces. Witnesses to the forced evacuation describe scenes of chaos as hundreds of people were driven north across the Ninevah plains and into the heavily-fortified city, where the extremists are believed to be preparing for a climactic showdown. (AP Photo/Marko Drobnjakovic)

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Iraqi special forces closing in on Mosul

CNN's Nick Paton Walsh is with Iraqi special forces outside Mosul, as the unit exchanges mortar fire with ISIS defenders blocking their advance.

Iraqi special forces closing in on Mosul

CNN's Nick Paton Walsh is with Iraqi special forces outside Mosul, as the unit exchanges mortar fire with ISIS defenders blocking their advance.