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ISIS using tens of thousands as human shields in Mosul

ISIS is using tens of thousands of people as human shields in Mosul as Iraqi and U.S. forces continue their large-scale offensive to retake Iraq's second-largest city.

UN cites 'credible reports' of residents being rounded up near besieged city

Displaced persons clear a checkpoint in Qayara, some 50 kilometres south of Mosul, Iraq, on Wednesday. ISIS militants have apparently been rounding up residents south of the city and using them as human shields. (Marko Drobnjakovic/Associated Press)

ISIS appears to be using tens of thousands of people as human shields in and around Mosul, where Iraqi forces are waging a large-scale offensive aimed at retaking the country's second largest city, the UN human rights office said Friday. 

It has received reports of more than 200 people being killed for refusing to comply with ISIS orders or previously belonging to Iraqi security forces. It said "credible reports" suggest the Islamic State in Iraq and Syria has been forcing tens of thousands from their homes in districts around Mosul.

The militant group's "depraved, cowardly strategy is to attempt to use the presence of civilian hostages to render certain points, areas or military forces immune from military operations, effectively using tens of thousands of women, men and children as human shields," spokeswoman Ravina Shamdasani said in Geneva.

She said 232 people, mostly former officers, were reportedly shot Wednesday, and 24 on Tuesday.

A woman prays over the grave of a family member at a graveyard damaged by ISIS extremists in Qayara. Iraqi and U.S. forces have reclaimed 40 villages surrounding the city from ISIS. (Marko Drobnjakovic/Associated Press)

The Associated Press reported earlier this week that ISIS militants were going door to door in villages south of Mosul, ordering hundreds of civilians at gunpoint on a forced march north into the city, apparently using them as human shields.

Iraq launched a massive operation on Oct. 17 aimed at retaking Mosul, which fell to ISIS in a matter of days in the summer of 2014. Iraqi forces are advancing from several directions, but are still well outside the city itself.

The UN and rights groups have expressed fear that more than 200,000 civilians could be displaced in the opening weeks of the offensive. Mosul is still home to more than a million people.

ISIS has built up elaborate defences on the outskirts of the city, including an extensive tunnel network, and has planted large numbers of explosive booby traps to slow the troops' progress.

A soldier with Iraq's elite counterterrorism force, left, inspects a tunnel made by ISIS militants in Bartella, Iraq, 20 kilometres east of Mosul. ISIS has built an extensive tunnel network around the city. (Ali Abdul Hassan/Associated Press)

The U.S. military says Iraqi forces have retaken 40 villages from ISIS near Mosul since the operation began. But most of the fighting has taken place in a belt of sparsely populated farming communities ringing the city.

U.S. Air Force Brig. Gen. Matthew C. Isler said Iraqi troops on Friday were consolidating gains made east and south of the city earlier this week, but insisted "momentum" was still on their side.

Isler says the U.S.-led coalition has stepped up airstrikes against the militants, and is carrying out three times as many as it did during previous campaigns to drive ISIS from other Iraqi cities.