Mourners react during the funeral of a fighter who was killed in clashes with Islamic State militants in Baiji, during a funeral in Najaf, south of Baghdad, June 8, 2015. REUTERS/Stringer TPX IMAGES OF THE DAY

A damaged mosque is seen amidst destroyed vehicles and other debris in Tikrit April 1, 2015. The Iraqi government claimed victory over Islamic State insurgents in Tikrit on Wednesday after a month-long battle for the city supported by Shi'ite militiamen and U.S.-led air strikes, saying that only small pockets of resistance remained. Picture taken April 1, 2015. REUTERS/Thaier Al-Sudani TPX IMAGES OF THE DAY

An Iraqi Shi'ite fighter stands guard on top of a building on the outskirts of Diyala province, north of Baghdad February 8, 2015. REUTERS/Ahmed Saad

Members of Hashid Shaabi forces ride in a vehicle as smoke rises in shops at al-Qadisiya neighborhood, north of Tikrit April 3, 2015. REUTERS/Stringer 

Female Kurdistan Workers Party (PKK) fighters walk through destroyed houses, which were freed by them from Islamic State fighters, in Sinjar, March 11, 2015. Women fighters at a PKK base on Mount Sinjar in northwest Iraq, just like their male counterparts, have to be ready for action at any time. Smoke from the front line, marking their battle against Islamic State, which launched an assault on northern Iraq last summer, is visible from the base. Many of the women have cut links with their families back home; the fighters come from all corners of the Kurdish region. REUTERS/Asmaa Waguih

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A destroyed Shi'ite mosque is seen on the outskirts of Diyala province, north of Baghdad February 8, 2015. REUTERS/Ahmed Saad