A man stands in front of an oil fire burning in the Qayyarah area, some 60 kilometers (35 miles) south of Mosul, on October 19, 2016, during an operation by Iraqi forces against ISIS jihadists to retake the main hub city. #

Iraqi Kurdish Peshmerga fighters fire a rocket launcher from a position in Sheikh Ali village near the town of Bashiqa, 25 kilometers north east of Mosul, on October 20, 2016, during an operation against ISIS. #

This photo taken on Sunday, October 16, 2016 and released on Tuesday, October 18, 2016 by the French Army Communications Audiovisual office shows French army Rafale fighter jets taking off from the deck of France's aircraft carrier Charles De Gaulle, in the Mediterranean sea. Seven French Rafale jets, from the Air Force and the Navy, carried out airstrikes south of Mosul overnight October 15-16 with SCALP missiles that destroyed a factory making improvised explosive devices. #

An Iraqi soldier protects himself from the dust as he sits on a vehicle heading to the front line in Kani al-Harami, 35 kilometers outside Mosul, on October 19, 2016. #

A Kurdish Peshmerga fighter leans out of his military vehicle which has taken several direct hits from ISIS snipers including on the windscreen on October 18, 2016 in the small town of Bartella near Mosul. #

Iraqi forces sit in the back of a vehicle as troops advance through the desert on the banks of the Tigris river, northeast of the main staging base of Qayyarah, on October 20, 2016. #

A Kurdish Peshmerga soldier walks through the rubble of a village previously held by ISIS and hit by a coalition airstrike the battle to retake Mosul, on October 18, 2016 in Bartella, Iraq. #

An Iraqi Kurdish Peshmerga fighter stands inside of a damaged building on October 18, 2016 on the frontline in Shaqouli village, about 35 kilometers east of Mosul, after they recaptured it from ISIS jihadists. #

A peshmerga fighter walks through the kitchen of an underground tunnel made by ISIS fighters on October 18, 2016. The Kurdish forces found the tunnel in the town of Badana that was liberated on Monday. The fighters built tunnels under residential areas so they could move without being seen from above to avoid airstrikes. #

A picture taken on October 18, 2016 shows a helicopter prowling the perimeter of the Qayyarah military base, about 60 kilometers (35 miles) south of Mosul. Qayyarah base was retaken from ISIS earlier this year and is now a key logistics hub for the major multi-pronged operation to recapture Mosul, Iraq's second city. It houses members of the US-led coalition against IS, which is providing support to Iraqi forces. #

A man takes a selfie in front of an oil fire in the Qayyarah area, 60 kilometers (35 miles) south of Mosul, on October 19, 2016, during an operation by Iraqi forces against ISIS. #

Displaced Iraqis from the Bajwaniyah village, about 30 km south of Mosul, who fled fighting in the Mosul area carry a white flag as they approach security forces on October 18, 2016 after they liberated the village from ISIS. #

A young Iraqi refugee, who fled due to the ongoing conflict between pro-government forces and ISIS jihadists, walks at a camp in the northeastern town of al-Hol in Syria's Hasakeh province on October 19, 2016. #

Iraqi Kurdish Peshmerga fighters stand in an area near the town of Bashiqa, 25 kilometers northeast of Mosul, as smoke billows on October 20, 2016, during an operation against ISIS to retake the main hub city. #