Iraqi Special Operations Forces (ISOF) clashes with Islamic State militants in the frontline near the university of Mosul, Iraq, January 13, 2017. (Photo by Ahmed Saad/Reuters)





Iraqi Special Operations Forces (ISOF) fires toward Islamic State militants during clashes in the frontline at at the University of Mosul, Iraq, January 13, 2017. (Photo by Ahmed Saad/Reuters)





Iraqi Special Operations Forces (ISOF) run with their weapons during clashes with Islamic State militants in frontline near university of Mosul, Iraq, January 13, 2017. (Photo by Ahmed Saad/Reuters)





Iraqi Special Operations Forces (ISOF) carry weapons during clashes with Islamic State militants in frontline near university of Mosul, Iraq, January 13, 2017. (Photo by Ahmed Saad/Reuters)





Iraqi Special Operations Forces (ISOF) run with their weapons during clashes with Islamic State militants in frontline near university of Mosul, Iraq, January 13, 2017. (Photo by Ahmed Saad/Reuters)





Iraqi Special Operations Forces (ISOF) shout slogans during battle with Islamic State militants east of Mosul, Iraq, January 13, 2017. (Photo by Ahmed Saad/Reuters)





Cloud of smoke rises from a car bomb belonging to Islamic State militants after a controlled explosion by the Iraqi Federal police, during clashes with Islamic State militants, eastern Mosul, Iraq, January 13, 2017. (Photo by Alaa Al-Marjani/Reuters)





A member of Iraqi Federal police fire toward Islamic State militants during clashes with Islamic State militants, eastern Mosul, Iraq, January 13, 2017. (Photo by Alaa Al-Marjani/Reuters)





Iraqi Federal police fire during clashes with Islamic State militants, in the Sumer neighborhood of Mosul, Iraq, January 13, 2017. (Photo by Alaa Al-Marjani/Reuters)





Iraqi rapid response forces eat food during clashes with Islamic State militants, in Sumer neighborhood of Mosul, Iraq, January 13, 2017. (Photo by Alaa Al-Marjani/Reuters)





A member of the Iraqi federal police carries a rocket launcher during clashes with Islamic State militants, in the Sumer neighborhood of Mosul, Iraq, January 13, 2017. (Photo by Alaa Al-Marjani/Reuters)





A member of Iraqi Special Operations Forces (ISOF) sits in a military vehicle during clashes with Islamic State militants in frontline near university of Mosul, Iraq, January 13, 2017. (Photo by Ahmed Saad/Reuters)





Members of the Iraqi Special Operations Forces (ISOF) stand at the University of Mosul during a battle with Islamic State militants, in Mosul, Iraq, January 14, 2017. (Photo by Ahmed Saad/Reuters)





The interior of a burnt building of the University of Mosul is seen during a battle with Islamic State militants, in Mosul, Iraq, January 14, 2017. (Photo by Ahmed Saad/Reuters)





A member of Iraqi Special Operations Forces (ISOF) stands at the University of Mosul during a battle with Islamic State militants, in Mosul, Iraq, January 14, 2017. (Photo by Ahmed Saad/Reuters)





A destroyed building of the University of Mosul is seen during a battle with Islamic State militants, in Mosul, Iraq, January 14, 2017. (Photo by Ahmed Saad/Reuters)





A member of Iraqi Special Operations Forces (ISOF) carries a rocket launcher at the University of Mosul during a battle with Islamic State militants, in Mosul, Iraq, January 14, 2017. (Photo by Ahmed Saad/Reuters)





A member of Iraqi Special Operations Forces (ISOF) stands in a military vehicle at the University of Mosul during a battle with Islamic State militants, in Mosul, Iraq, January 14, 2017. (Photo by Ahmed Saad/Reuters)





A member of Iraqi Special Operations Forces (ISOF) rests at the University of Mosul during a battle with Islamic State militants, in Mosul, Iraq, January 14, 2017. (Photo by Ahmed Saad/Reuters)





Iraqi Federal police take cover near the Tigris river during a battle with Islamic State militants in the district of Yarimja in southern Mosul, Iraq, January 14, 2017. (Photo by Ahmed Saad/Reuters)





A member of the Iraqi rapid response forces takes cover near the Tigris river seen during a battle with Islamic State militants in the district of Yarimja in southern Mosul, Iraq, January 14, 2017. (Photo by Alaa Al-Marjani/Reuters)





Iraqi rapid response forces ride on an armoured vehicle during a battle with Islamic State militants east of Mosul, Iraq, January 14, 2017. (Photo by Alaa Al-Marjani/Reuters)





A member of Iraqi Special Operations Forces (ISOF) sits in a military vehicle at the University of Mosul during a battle with Islamic State militants, in Mosul, Iraq, January 15, 2017. (Photo by Ahmed Saad/Reuters)





Iraqi Special Operations Forces (ISOF) gather at the University of Mosul during a battle with Islamic State militants, in Mosul, Iraq, January 15, 2017. (Photo by Ahmed Saad/Reuters)





ISOF members search a house, which is next to Mosul University, for Islamic State militants and improvised explosive devices (IEDs), in Al-Andalus, east of Mosul, Iraq, January 15, 2017. (Photo by Ahmed Saad/Reuters)





A member of the Iraqi Special Operations Forces (ISOF) holds weapons during a battle with Islamic State militants near Mosul University, in Al-Andalus, Iraq, January 15, 2017. (Photo by Ahmed Saad/Reuters)





Members of the Iraqi Special Operations Forces (ISOF) search a house, which is next to Mosul University, for Islamic State militants and improvised explosive devices (IEDs), in Al-Andalus, east of Mosul, Iraq, January 15, 2017. (Photo by Ahmed Saad/Reuters)





Empty shells, which Iraqi forces believe are used by Islamic State militants to create bombs, are pictured at the University of Mosul during a battle with Islamic State militants, in Mosul, Iraq, January 15, 2017. (Photo by Ahmed Saad/Reuters)





A suspect sits in the back of a vehicle of Iraqi rapid response forces during a battle with Islamic State militants in the district of Yarimja in southern Mosul, Iraq, January 14, 2017. (Photo by Alaa Al-Marjani/Reuters)





Iraqi Special Operations Forces (ISOF) stand near a tank at the University of Mosul during a battle with Islamic State militants, in Mosul, Iraq, January 15, 2017. (Photo by Ahmed Saad/Reuters)





Members of the Iraqi Special Operations Forces (ISOF) ride in military vehicle during a battle with Islamic State militants, in Al-Andalus, east of Mosul, Iraq, January 15, 2017. (Photo by Ahmed Saad/Reuters)





Iraqi Special Operations Forces (ISOF) gather near a building of the University of Mosul during a battle with Islamic State militants, in Mosul, Iraq, January 15, 2017. (Photo by Ahmed Saad/Reuters)





An Iraqi special forces Counter Terrorism Service (CTS) member screams during a battle against Islamic State group jihadists (IS) in Mosul's al-Rifaq neighbourhood on January 8, 2017, as an ongoing military operation against the militants continues. Elite Iraqi forces battling the Islamic State group in eastern Mosul reached the Tigris River that splits the city in two for the first time, a spokesman said. (Photo by Dimitar Dilkoff/AFP Photo)





People cross a bridge destroyed by Islamic State militants in a neighborhood recently liberated from Islamic State on the eastern side of Mosul, Iraq, Sunday, January 15, 2017. (Photo by Khalid Mohammed/AP Photo)