Iraqi special forces arrest a fighter with Islamic State militia in Mosul, Iraq, Saturday, Feb. 25. 2017. An Iraqi commander says special forces troops are progressing through western Mosul and encountering stiff resistance from entrenched Islamic State fighters. (AP Photo/Khalid Mohammed)
Iraqi special forces arrest a fighter with Islamic State militia in Mosul, Iraq, Saturday, Feb. 25. 2017. An Iraqi commander says special forces troops are progressing through western Mosul and encountering stiff resistance from entrenched Islamic State fighters. (AP Photo/Khalid Mohammed) Credit: Khalid Mohammed

The Iraqi advance into Mosul’s western half slowed Saturday as combat turned to urban warfare and Iraqi forces met stiff resistance from the Islamic State group. Hundreds of civilians poured out of Mosul on foot following the advances, but the vast majority of 750,000 estimated to still be in the city’s west remain trapped, and describe deteriorating humanitarian and security conditions.

Special forces Lt. Gen. Abdul-Wahab al-Saadi said that his troops are “moving very slowly” and that ISIS fighters are responding with car bombs, snipers and dozens of armed drones.

The drones have caused relatively few deaths, but have inflicted dozens of light injuries that have disrupted the pace of ground operations.

Al-Saadi said the Mamun neighborhood was particularly difficult because its streets are not organized in a grid. “The roads are random,” he said, which makes it more difficult for his men to set up roadblocks to stop car bombs.

But al-Saadi said he expects the pace to increase after Iraqi forces retake territory and infrastructure on Mosul’s southwestern edge – which will allow them to shorten supply lines and link up with forces in the city’s east.

Along the road beside al-Saadi’s base of operations, hundreds of civilians fleeing Mosul walked slowly past, many with sheep, cows and goats in tow. Nearly all of the hundreds who fled Saturday trekked more than three miles from the city’s edge to a small village serving as a screening center.

Dozens of families gathered against a crude cinderblock wall at the screening center south of Mosul. Intelligence officials at the site said after documents were checked families would either be moved into nearby abandoned houses or newly erected camps for the displaced.

Many of those fleeing said they were from villages outside Mosul and had been forced to march to the city more than four months ago to serve as human shields.

Groups of men were screened at the site against a database of ISIS suspects and two prisoners were dragged past the crowd and into an abandoned building.

Meanwhile, the Saudi Foreign Minister was in Baghdad Saturday – the first high level visit of a Saudi official to the country since the 2003 U.S.-led invasion – to meet with his Iraqi counterpart, Ibrahim al-Jaafari, and Prime Minister Haider al-Abadi.

In a statement issued by the foreign ministry, al-Jaafari said the visit was to discuss cooperation in combating terrorism, adding, “The ties that bind are many, and the visit comes to restore bilateral relations to their correct course.”

The statement also called on Saudi Arabia to reiterate its position against Turkish ground troops in Iraq.