Iraqi special forces have moved more than 1,000 people from villages near the front lines of the battle to retake the Islamic State-held city of Mosul.
Major General Haider Fadhil said residents of Tob Zawa and other villages were taken to a camp in the nearby Khazer region for their safety.
The International Organisation for Migration said at least 8,940 people have been displaced since the operation to retake Mosul began on October 17th.
The special forces were undertaking clean-up operations in areas retaken from the militants to the east of the city, where troops uncovered a vast tunnel network used by IS to shuttle fighters and supplies by motorcycle, Major Salam al-Obeidi said.
Iraqi forces have been pushing towards Mosul from several directions since the launch of the wide-scale offensive, which involves more than 25,000 Iraqi soldiers, Kurdish forces, Sunni tribal fighters and state-sanctioned Shia militiamen.
It is expected to take weeks, if not months, to drive Islamic State, also known as Isis, from its last urban bastion in the country.
The militants have had months to prepare for the long-awaited operation and are believed to have developed extensive defences in and around the city.
In recent weeks they are also said to have targeted alleged spies and others they fear may rise up against them.
The UN High Commissioner for Human Rights said on Tuesday that Islamic State appears to have carried out a number of atrocities in recent days in and around Mosul, including killing 50 former Iraqi police officers they had been holding in a building near the city.
Spokesman Rupert Colville said Iraqi forces found the bodies of 70 civilians who had been shot dead in the Tuloul Nasser village, some 35 kilometres south of Mosul.
He said it was not immediately clear who was responsible for the killings and cautioned that it was hard to immediately verify the reports.
He told reporters in Geneva that the UN rights body had also received reports that the militants gunned down 15 villagers south of the city and threw their bodies in a river.
In the same village, Islamic State fighters tied six people to vehicles by their hands and dragged them around because they were related to a tribal leader battling the extremists, he said.
“We very much fear that these will not be the last such reports we receive of such barbaric acts,” Mr Colville said.
The UN and rights groups have expressed fears that the group may use civilians as human shields as Iraqi forces converge on the country’s second largest city, which is still home to more than one million people.
Mr Colville said Islamic State fighters shot dead three women and three girls because they were lagging behind as the militants were forcibly relocating them to another district south of Mosul.
He said they were going slowly because one of the girls had a disability.
Mr Colville also expressed concern over the "severe measures" taken by local Iraqi Kurdish authorities in Kirkuk following a massive Islamic State assault on the city last week.
He said they ordered all internally displaced people living outside established refugee camps to vacate their residences and move into the camps, some of which are already full.
“We understand that hundreds of families have now been evicted by Kurdish security forces and are worried that if the evictions continue, it could significantly complicate the already alarming situation of mass displacement in the region,” he said.
PA