Pushing his way through dozens of people, Iraqi teacher Umar Salah carries four bags containing 15 blankets and pots of food through the gate of a camp overcrowded with civilians who fled ISIL in Mosul.

Soldiers only occasionally open the gate to allow civilians to bring supplies to relatives inside, as authorities struggle to accommodate some 1,000 people fleeing the fighting every day since Iraqi forces launched a campaign to expel the armed group.

Iraqi Special forces screen males, looing for ISIL fighters [Reuters]

US-backed Iraqi government troops and Kurdish security forces have launched the biggest battle in Iraq since the 2003 US-led invasion to drive ISIL fighters from Mosul, the group's last major bastion in the country, many times larger than any other city the fighters have held.

The UN is asking donors to fund winter kits for 1.2 million people - preparing for a worst case scenario that much of the city's population may have to flee. Seventy-two thousand have fled so far, and winter has brought freezing temperatures.

The Kurdish authorities are requiring fleeing civilians to stay in camps even if they have family outside, so that males can be checked for ties to ISIL. Relatives crowded out front, bringing blankets and pillows.

"My relatives have ice on their tent at night," said Salah, as he waited for his cousins and their five children to pick up the bags. "They don't get enough blankets so I brought them from my house."

Salah escaped Mosul for Kurdish-held Erbil, 60km east of the city, when ISIL swept through the area in June 2014. The rest of his family fled two weeks ago.

Males who have been displaced have to hand over their ID cards on the day they arrive.

"I want to stay with my family in Erbil, but they keep us here," said a young man, who gave his name only as Hisham, standing in front of a tent with his veiled wife and baby.

"I have been waiting for three weeks," he said.

Creating space in de-mined fields

The two main camps, Hasan Sham camp hosting 10,800, and the nearby Khazer camp home to 29,000, are full.

The United Nations refugee agency UNHCR started work on Sunday on another camp nearby, clearing the ground of landmines to set up 1,600 tents. Government workers are also setting up more blue tents at the Hasan Sham camp.

 Battle for Mosul: Shortage of medical care

UNHCR told Al Jazeera in the lead up to the Mosul offensive that setting up camps in advance was impossible as it was feared tents would be stolen. Finding suitable land for the camps had proved a major challenge.

The UN has opened another camp in Tikrit, south of Mosul, while near Tal Afar in the west, a flashpoint town where thousands of people have fled, another camp will be launched this week, the UNHCR said.

Expecting a longer stay as the battle drags on, many families bring in stoves and kitchen utensils. With soldiers turning back most people at the camp gate, dozens threw their bags over the fence.

Parents were registering children to attend schools inside the camps, often their first opportunity for regular schooling in years.

"Children lost two years because schools were closed under Daesh or taught only Islamic law," said a teacher who gave his name as Ali, who was using the Arabic acronym for ISIL.

Having himself fled ISIL, he applied to work in the camp schools. His own village is only 500 metres away, but the army has not opened it to civilians yet because the frontline is still too close.

"The children need to go back to school while we wait here."

Source: Reuters