>> Satellite images showing the impact of air and artillery attacks in Mosul. Iraqi forces making progress in their assault on the IS held city. But there is growing concern that the militants are using human shields. Local people contacted by phone by Reuters, they say IS is stopping residents from fleeing parts of the city caught up in battle.
Some people are being directed to buildings recently used by the militants, that makes them likely targets for airstrikes. Now Iraqi forces have left open a corridor to the West of the city. They're giving local people a chance to flee. But, IS may be blocking the exit. And with over a million civilians thought to remain in Mosul the militants won't run short of human shields.
Reuters correspondent Dominic Evans.>> Their presence obviously makes the military operation hugely more complicated. It will slow things down. And that sheer size of the city means it is unprecedented in terms of operations that have been carried out for the last two years in Iraq, it is five times bigger.
>> A Pentagon spokesman says it believes IS has been using human shields for weeks. US Intelligence also indicating that jihadi leader Abu Bakr al-Baghdadi remains in the city. All the signs are that IS intends to make this a long battle.