Iraq's elite troops evacuate 1,000 civilians from Mosul front lines
Iraqi special forces have moved more than 1,000 people out of villages near the front lines of the battle to retake the Islamic State-held city of Mosul and surrounding areas.
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 around 9,000 people have been displaced since the operation to retake Mosul began on October 17.
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.
To the south of Mosul, another Iraqi commander said IS has been withdrawing from the town of Shura towards the city, taking civilians with them to use as human shields and leaving behind explosive booby traps to slow the troops' advance.
"These small villages are secondary to them, Mosul is much more important," said Brigadier General Alaa Mehsin, of the Iraqi army's 15th Division. "They don't want to waste their energy."
He said a small number of fighters and civilians were still inside the town.
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 Shiite militiamen.
It is expected to take weeks, if not months to drive IS 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.
"They've really dug in, literally, and started putting up the berms, the trenches, the tunnelling systems," said a US military official.
"And they're quite extensive tunnelling systems, some of them stretching upward of two kilometres (over a mile)."
He said Iraqi forces have found homes near Mosul where the lights are wired with explosives that detonate if you flip the switch.
Inside Mosul, IS has set up large concrete barriers known as T-walls, blocking off several streets.
IS is also believed to have grown increasingly brutal as it seeks to eliminate any potential threats from among the local population, killing alleged spies as well as former members of the Iraqi security forces.
The UN High Commissioner for Human Rights said on Tuesday that IS appears to have carried out a number of abuses 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 (20 miles) 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 also had reports that the militants gunned down 15 villagers south of the city and threw their bodies in a river.
In the same village, IS 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 IS may use civilians as human shields as Iraqi forces converge on the country's second largest city, which is still home to more than a million people.
Mr Colville said IS 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 IS assault on the northern city last week.
He said they had 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.