Family members and friends of the victims of the Istanbul attack paid tribute at a memorial service Thursday at Ataturk Airport. Turkish authorities say the evidence points to three Russian-speaking suicide bombers who were part of the Islamic State. Emrah Gurel/AP hide caption

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A child leans on the coffin of his uncle, Habibullah Sefer, on Thursday. Sefer, along with more than 40 other people, was killed in a suicide attack on Tuesday at the Ataturk airport in Istanbul. Ozan Kose/AFP/Getty Images hide caption

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Bullet impacts are pictured at Istanbul's Ataturk airport on Wednesday, a day after a suicide bombing and gun attack killed more than 40 people. Ozan Kose/AFP/Getty Images hide caption

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Passengers leave Istanbul Ataturk, Turkey's largest airport, after a suicide bomb attack Tuesday killed at least 42 people and wounded more than 230 people. Defne Karadeniz/Getty Images hide caption

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U.S. Envoy: 'We're Taking Out' About 1 ISIS Leader Every 3 Days

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Workers clean the debris from yesterday's blasts at Ataturk Airport in Istanbul on Wednesday. Defne Karadeniz/Getty Images hide caption

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'I heard the shooting ... '

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A woman puts a placard at the site of a blast on Istiklal Street, a major shopping and tourist district, in central Istanbul, on Saturday. The sign reads in Turkish, "We are not afraid, we are here, we won't adjust," according to an AFP translation. Bulent Kilic/AFP/Getty Images hide caption

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Ambulances and police are seen at the blast site after an explosion in Istanbul's central Sultanahmet district. At least 10 people were killed and 15 wounded in a suicide bombing near tourists in central Istanbul's historic Sultanahmet district. Can Erok/Getty Images hide caption

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Explosion In Heart Of Istanbul's Tourist Area Kills At Least 10

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Anti-government protesters demonstrate in Istanbul near a Turkish broadcaster which was taken over by police. The company owns opposition television stations Bugun TV and Kanalturk. Lefteris Pitarakis/AP hide caption

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A Marmaray Project train awaits its inauguration ceremony in Istanbul on Tuesday. Ozan Kose/AFP/Getty Images hide caption

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Ottoman Dream Come True: Train Links East And West In Istanbul

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Japan's Mizuho Financial Group Inc. said it had punished a total of 54 current and former executives over its loans to organized crime groups, but a third-party panel found no sign of a deliberate cover-up. Mizuho Bank president Yasuhiko Sato said his salary would be cut for six months and other executives would step down from their posts or face pay reductions. Frank Robichon/EPA /LANDOV hide caption

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Tokyo will host the 2020 Summer Games, IOC officials said Saturday. In Tokyo, five-time Paralympian Wakako Tsuchida, left, and former Olympic athletes Hiromi Miyake, center, and Yoshiyuki Miyake cheer the news. Atsushi Tomura/Getty Images hide caption

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