Baghdad

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In this Tuesday, May 12, 2015, picture, Iraqi security forces search Shiite pilgrims marching toward the Imam Mousa al-Kazim shrine to commemorate the anniversary of the imam's death in Baghdad, Iraq, The anniversary of the 8th-century imam's death draws tens of thousands of Shiites from all walks to converge on his golden-domed shrine in northern Baghdad. The pilgrims typically march to the shrine while hundreds of tents are erected to offer them free food, drinks and services. (AP Photo/Hadi Mizban)

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People observe ancient artifacts at the Iraqi National Museum after its reopening in the wake of the recent destruction of Assyrian archaeological sites by the Islamic State group in Mosul, as they visit the museum in Baghdad in this Sunday, March 15, 2015, file photo. (AP Photo/Karim Kadim, File)

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Civilians and security forces inspect the scene of a car bomb explosion in Karrada neighborhood, Baghdad, Iraq, Saturday, May 9, 2015. (Associated Press) ** FILE **

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Demonstrators chant pro-Islamic State group slogans as they wave the Islamic State group's flags in front of the provincial government headquarters in Mosul, 225 miles (360 kilometers) northwest of Baghdad, Iraq, June 16, 2014. (Associated Press) ** FILE **

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Iraqi security forces and allied Shiite militiamen celebrate March 31, 2015, as they hold a flag of the Islamic State group they captured in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq. Iraqi forces battled Islamic State militants holed up in downtown Tikrit, going house to house Tuesday in search of snipers and booby traps, and the prime minister said security forces had reached the heart of the city. (Associated Press) **FILE**

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Shiite clerics inspect one of Saddam Hussein's palaces in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Thursday, April 2, 2015, a day after Iraqi security forces backed by Shiite militiamen took control of the city from Islamic State militants. (AP Photo/Khalid Mohammed)

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Imam Ali Brigades, members of of an Iraqi Shiite militant group, launch rockets against Islamic State extremist positions during clashes in Tikrit, 130 kilometers (80 miles) north of Baghdad, Iraq, Tuesday, March 24, 2015. (AP Photo/Khalid Mohammed)

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In this Saturday, March 21, 2015, a volunteer fighter with a Shiite militant group known as 'Jihad Brigades,' aims his weapon during clashes with Islamic State group militants, outside Tikrit, 130 kilometers (80 miles) north of Baghdad, Iraq. (AP Photo)

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Hakim al-Zamili, a parliament member and head of Security and Defense Committee, right, visits the front line during a battle against Islamic State militants in Tikrit, 130 kilometers (80 miles) north of Baghdad, Iraq, Monday, March 16, 2015. The offensive to retake Saddam Hussein's hometown of Tikrit began March 2. The city is one of the largest held by the Islamic State militants on the road connected Baghdad and Mosul. Iraqi Interior Minister Mohammed Salem al-Ghabban said Monday that the campaign had halted temporarily to allow civilians in the city to evacuate and to enable troops to clear roadside bombs planted by the extremists. (AP Photo/Khalid Mohammed)

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Young volunteer militia pose for a picture before going into battle against Islamic State fighters in Tikrit, 130 kilometers (80 miles) north of Baghdad, Iraq, Sunday, March 15, 2015. (AP Photo/Khalid Mohammed)

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National Edition News cover for March 13, 2015 - Iraqis battle Islamic State for strategic, symbolic Tikrit: An Iraqi Army armored vehicle prepares to attack Islamic State extremists in Tikrit, 80 miles (130 kilometers) north of Baghdad, Iraq, Thursday, March 12, 2015. Rockets and mortars echoed across Saddam Hussein's hometown of Tikrit on Thursday as Iraqi security forces clashed with Islamic State militants a day after sweeping into the Sunni city north of Baghdad. (AP Photo/Khalid Mohammed)

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Italian Carabinieri keep alert as they guard the new exhibition of Iraqi treasures in the National Museum in Baghdad, on Thursday, July 3, 2003. The Iraqi National Museum briefly opened its doors to the press Thursday. Looting at the museum provoked an international outcry after Baghdad fell on April 9, but U.S. occupation authorities say many of the museum's most important items including the world-famous treasures of Nimrud have been accounted for. Still, scores of items remain missing, said museum director Donny George. The museum won't open to the public for about two years, George said. (AP Photo/Mikhail Metzel)

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People gather to share scarce water, in al-Baghdadi, about 180 kilometers (110 miles) northwest of Baghdad, Iraq, Thursday, Feb. 19, 2015. All across Iraq, there has been rapid advance by Islamic State extremists over the past year. (AP Photo)

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In this June 16, 2014, file photo, demonstrators chant pro-Islamic State group, slogans as they carry the group's flags in front of the provincial government headquarters in Mosul, 225 miles (360 kilometers) northwest of Baghdad. (AP Photo, File)

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Iraqi shop owners clean up the site of a suicide bombing that targeted a street filled with hardware stores, killing over 20 people and wounding at least 45, in the Iraqi capital's southeastern neighborhood of New Baghdad, Saturday, Feb. 7, 2015. A pair of bombings in the Iraqi capital Saturday killed more than three dozen people hours before the city's longtime curfew was set to come to an end. The other attack was in central Baghdad's popular Shorja market where police said two improvised explosive devices detonated 25 meters apart from one another. (AP Photo/Karim Kadim)