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Iraqi men mourn outside a mosque in the holy city of Najaf on August 13, 2015 during the funeral of Shiite victims of this morning's truck bombing in Baghdad's northern suburb of Sadr City. The attack claimed by the Islamic State group killed more than 50 people in the Shiite-majority area of the capital, in one of the deadliest single attacks in the city in months. AFP PHOTO / HAIDAR HAMDANI (Photo credit should read HAIDAR HAMDANI/AFP/Getty Images)

Iraqi men mourn outside a mosque in the holy city of Najaf on August 13, 2015 during the funeral of Shiite victims of this morning's truck bombing in Baghdad's northern suburb of Sadr City. The attack claimed by the Islamic State group killed more than 50 people in the Shiite-majority area of the capital, in one of the deadliest single attacks in the city in months. AFP PHOTO / HAIDAR HAMDANI        (Photo credit should read HAIDAR HAMDANI/AFP/Getty Images)