A member of the federal police forces takes a selfie in front of a defaced black flag commonly used by Islamic State militants, during a battle with Islamic State militants, in the Wahda district of eastern Mosul, Iraq, January 10, 2017. REUTERS/Alaa Al-Marjani - RTX2YB9S

A member of the Iraqi rapid response forces fires toward Islamic State militants during a battle in Mosul, Iraq, January 11, 2017. REUTERS/Alaa Al-Marjani - RTX2YHXJ

A man has his beard shaved, during a battle with Islamic State militants, eastern Mosul, Iraq, January 12, 2017. REUTERS/Alaa Al-Marjani - RTX2YNXL

Iraqi rapid response forces eat food during clashes with Islamic State militants, in Sumer neighborhood of Mosul, Iraq, January 13, 2017. REUTERS/Alaa Al-Marjani - RTX2YSZ3

A member of Iraqi security forces feeds a girl in al-Zuhoor neighborhood during a fight with Islamic State in Mosul, Iraq, January 9, 2017. REUTERS/Alaa Al-Marjani - RTX2Y5R0

A vehicle burns during a battle with Islamic State militants, in frontline east of Mosul, Iraq, January 11, 2017. REUTERS/Ahmed Saad - RTX2YHO2

Iraqi army members clash with Islamic State militants from the roof of a building, eastern Mosul, Iraq, January 12, 2017. REUTERS/Alaa Al-Marjani - RTX2YNU8

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. REUTERS/Alaa Al-Marjani - RTX2YSTH

A sniper from the Iraqi rapid response forces takes up position at a hospital damaged by clashes during a battle between Iraqi forces and Islamic State militants in the Wahda district of eastern Mosul, Iraq, January 8, 2017. REUTERS/Alaa Al-Marjani - RTX2XZ0O

Members of the Iraqi rapid response forces, search for weapons in civilians' homes during a battle with Islamic State militants, in the Wahda district of eastern Mosul, Iraq, January 10, 2017. REUTERS/Alaa Al-Marjani - RTX2YBB4

An injured boy get a treatment from Iraqi rapid response forces, eastern Mosul, Iraq, January 12, 2017. REUTERS/Alaa Al-Marjani - RTX2YNUD

A man smokes a waterpipe on the street during a battle with Islamic State militants, eastern Mosul, Iraq, January 12, 2017. REUTERS/Alaa Al-Marjani - RTX2YNYC

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATH The body of an Islamic State militant is seen on a street during clashes, in eastern Mosul, Iraq, January 13, 2017. REUTERS/Alaa Al-MarjaniTEMPLATE OUT - RTX2YT57

Men push a cart with a wounded from the clashes, eastern Mosul, Iraq, January 12, 2017. REUTERS/Alaa Al-Marjani - RTX2YNV1

Iraqi Special Operations Forces (ISOF) carry weapons during clashes with Islamic State militants in frontline near university of Mosul, Iraq, January 13, 2017. REUTERS/Ahmed Saad - RTX2YS39

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. REUTERS/Ahmed Saad - RTX2YT93

Displaced people ride in a donkey-drawn cart in al-Zuhoor neighborhood during a fight with Islamic State in Mosul, Iraq, January 9, 2017. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY - RTX2Y66A

Iraqi Special Operations Forces (ISOF) arrest a person suspected of belonging to Islamic State militants during a battle with Islamic State militants, east of Mosul, Iraq, January 10, 2017. REUTERS/Azad Lashkari - RTX2YBXC

An Iraqi soldier holds an Islamic State flag from a building, during a battle with Islamic State militants in Al-shuqaq neighbourhood north of Mosul, Iraq, January 9, 2017. REUTERS/Ari Jalal - RTX2Y5PF

Iraqi Special Operations Forces (ISOF) gather as the civilians stand near their homes during a battle with Islamic State militants, east of Mosul, Iraq, January 10, 2017. REUTERS/Azad Lashkari TPX IMAGES OF THE DAY - RTX2YAXB

Abu Wissam, whose wife and son were killed by Islamic State, cries as he holds up the militants' execution order for his son, east of Mosul, Iraq, January 11, 2017. Pictures January 11, 2017. REUTERS/Ahmed Saad - RTX2YNBO

Iraqi army members clash with Islamic State militants from the roof of a building, eastern Mosul, Iraq, January 12, 2017. REUTERS/Alaa Al-Marjani - RTX2YNXR

A member of Iraqi Federal police fire toward Islamic State militants during clashes with Islamic State militants, eastern Mosul, Iraq, January 13, 2017. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY - RTX2YT03

Members of the Iraqi rapid response forces fire missile toward Islamic State militants during a battle between Iraqi forces and Islamic State militants in Somer district of eastern Mosul, Iraq January 11, 2017. REUTERS/Alaa Al-Marjani - RTX2YHW0

An injured man gets a treatment from Iraqi rapid response forces, eastern Mosul, Iraq, January 12, 2017. REUTERS/Alaa Al-Marjani - RTX2YNVY

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. REUTERS/Ahmed Saad - RTX2YS72