Iraqi security forces deploy in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Wednesday, April 1, 2015. Iraqi security forces battled the last remaining pockets of Islamic State militants in Tikrit on Wednesday and were expected to gain full control of the city “within the coming hours”, the country's interior minister said. (Photo by Khalid Mohammed/AP Photo)

An Iraqi flag waves over the Tigris River at a checkpoint in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Wednesday, April 1, 2015. (Photo by Khalid Mohammed/AP Photo)

Iraqi security forces deploy in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Wednesday, April 1, 2015. (Photo by Khalid Mohammed/AP Photo)

Iraqi security forces deploy in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Wednesday, April 1, 2015. (Photo by Khalid Mohammed/AP Photo)

Iraqi security forces deploy in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Wednesday, April 1, 2015. (Photo by Khalid Mohammed/AP Photo)

A member from the Iraqi security forces beats an Islamic State insurgent, who was captured in Tikrit April 1, 2015. Iraqi troops and Shi'ite paramilitary fighters were battling Islamic State on Wednesday in northern Tikrit, which officials described as the Sunni Muslim militant group's last stronghold in the city. (Photo by Alaa Al-Marjani/Reuters)

A member from the Iraqi security forces looks at smoke rising in Tikrit April 1, 2015. (Photo by Alaa Al-Marjani/Reuters)

The city of Tikrit is seen April 1, 2015. (Photo by Thaier Al-Sudani/Reuters)

Iraqi security forces arrest a member of the Islamic State in Tikrit April 1, 2015. (Photo by Alaa Al-Marjani/Reuters)

Shi'ite paramilitary fighters gesture on the back of a vehicle in Tikrit April 1, 2015. (Photo by Alaa Al-Marjani/Reuters)

Iraqi security forces and Shi'ite paramilitary fighters hold an Islamist State flag, which they pulled down in Tikrit, March 31, 2015. (Photo by Alaa Al-Marjani/Reuters)

Members of the Iraqi security forces play soccer in Tikrit April 1, 2015. (Photo by Alaa Al-Marjani/Reuters)

Shi'ite paramilitary fighters and Iraqi security forces arrest Islamic State militants in Tikrit April 1, 2015. (Photo by Thaier Al-Sudani/Reuters)

Shiite paramilitary fighters inspect a building in Tikrit March 31, 2015. (Photo by Reuters/Stringer)

Iraqi security forces gather with their weapons at a building in Tikrit, March 27, 2015. (Photo by Thaier Al-Sudani/Reuters)

Iraqi security forces deploy in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Wednesday, April 1, 2015. (Photo by Khalid Mohammed/AP Photo)

A member of the Iraqi SWAT troopers gestures in Tikrit March 31, 2015. (Photo by Reuters/Stringer)

A member of the Iraqi security forces carries his weapon as he watches smoke rise from a scene of clashes between the Iraqi army and Islamic State militants in Tikrit, March 30, 2015. (Photo by Alaa Al-Marjani/Reuters)

Iraqi security forces stand on their military vehicles in Tikrit, March 27, 2015. (Photo by Thaier Al-Sudani/Reuters)

A member of the Iraqi security forces uses binoculars as he keeps watch in Tikrit, March 30, 2015. (Photo by Alaa Al-Marjani/Reuters)

Members of the Hashid Shaabi (Popular Mobilization) forces, which allied with Iraqi forces, chant slogans against the Islamic State in Tikrit, March 30, 2015. (Photo by Alaa Al-Marjani/Reuters)

Iraqi security forces launch a rocket towards Islamic State militants during clashes at a frontline in Tikrit, March 28, 2015. (Photo by Thaier Al-Sudani/Reuters)

Shiite clerics from Hashid Shaabi (Popular Mobilization) forces, allied with Iraqi forces against the Islamic State, pray in Tikrit, March 28, 2015. (Photo by Thaier Al-Sudani/Reuters)

Smoke rises during clashes between Islamic state militants and the Iraqi army in Tikrit, March 30, 2015. (Photo by Alaa Al-Marjani/Reuters)

A member of the Iraqi army carry a rocket as he prepares to launch towards Islamic State militants in Tikrit, March 30, 2015. (Photo by Alaa Al-Marjani/Reuters)

Shi'ite paramilitary fighters launch a rocket towards Islamic State militants in Tikrit March 31, 2015. (Photo by Alaa Al-Marjani/Reuters)

A Shi'ite paramilitary fighter puts Iraqi flags on a wall painted with the black flag commonly used by Islamic State militants in Tikrit March 31, 2015. (Photo by Reuters/Stringer)

A member of the Iraqi security forces checks his weapon in Tikrit, March 30, 2015. (Photo by Alaa Al-Marjani/Reuters)

An Iraqi security forces military vehicle drives through Tikrit March 31, 2015. (Photo by Reuters/Stringer)