UN spokesperson Ravina Shamdasani, citing "corroborated information" from the area, said the office was also investigating reports that Islamic State militants had killed 40 civilians in one village.
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The global terror group launched a major counter-attack on the city of Kirkuk on Friday as Iraqi and Kurdish forces pursued operations to seize territory around Mosul in preparation for an offensive on the extremists' last major stronghold in Iraq.
Islamic State's assault on Kirkuk, which lies in an oil- producing region, killed 18 members of the security forces and workers at a power station outside the city, including two Iranians, a hospital source said.
Crude oil production facilities were not targeted and the power supply continued uninterrupted in the city. Kirkuk is located east of Hawija, a pocket still under control of Islamic State that lies between Baghdad and Mosul.
With air and ground support from the US-led coalition, Iraqi government forces captured eight villages south and southeast of Mosul. Kurdish forces attacking from the north and east also captured several villages, according to statements from their respective military commands overnight.
The offensive that started on Monday to capture Mosul is expected to become the biggest battle fought in Iraq since the US-led invasion in 2003. The United Nations says Mosul could require the biggest humanitarian relief operation in the world, with worst-case scenario forecasts of up to a million people being uprooted. About 1.5 million residents are still believed to be inside Mosul.
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The fighting has forced 5,640 people to flee their homes so far from the vicinity of the city, the International Organisation for Migration said late on Thursday. The Turkish Red Crescent said it was sending aid trucks to northern Iraq with food and humanitarian supplies for 10,000 people displaced by fighting around Mosul.
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