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A huge crack is seen in the harbor after an earthquake in Kos on the island of Kos, Greece Friday, July 21, 2017. Greek authorities said two tourists killed in the overnight quake are from Turkey and Sweden.(AP Photo/Michael Probst)

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A toppled column is seen in the harbor after an earthquake in Kos on the island of Kos, Greece Friday, July 21, 2017. Greek authorities said two tourists killed in the overnight quake are from Turkey and Sweden.(AP Photo/Michael Probst)

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Cracks are seen on the facade of a church after an earthquake in Kos on the island of Kos, Greece Friday, July 21, 2017. Greek authorities said two tourists killed in the overnight quake are from Turkey and Sweden.(AP Photo/Michael Probst)

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Cracks are seen on the facade of a church after an earthquake in Kos on the island of Kos, Greece Friday, July 21, 2017. Greek authorities said two tourists killed in the overnight quake are from Turkey and Sweden.(AP Photo/Michael Probst)

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A man gestures in front of the toppled minaret of a mosque after an earthquake in Kos on the island of Kos, Greece Friday, July 21, 2017. Greek authorities said two tourists killed in the overnight quake are from Turkey and Sweden.(AP Photo/Michael Probst)

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The broken quay wall is raised by several inches in the harbor after an earthquake in Kos on the island of Kos, Greece Friday, July 21, 2017. Greek authorities said two tourists killed in the overnight quake are from Turkey and Sweden.(AP Photo/Michael Probst)

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Hotel residents sleep outdoors after abandoning their rooms following an earthquake in Bitez, a resort town about 6 kilometers (4 miles) west of Bodrum, Turkey, early Friday, July 21, 2017 A powerful earthquake struck Turkey's Aegean coast and nearby Greek islands, sending frightened residents running out of buildings they feared would collapse and into the streets. (AP Photo/Ayse Wieting)

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A damaged building is seen after an earthquake on the Greek island of Kos early Friday, July 21, 2017. A powerful earthquake struck Turkey's Aegean coast and nearby Greek islands, sending frightened residents running out of buildings they feared would collapse and into the streets. (Kalymnos-news.gr via AP)

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Damage and flooding are seen on a coastal road following a strong earthquake on the Greek island of Kos early Friday, July 21, 2017. A powerful earthquake struck Greek islands and Turkey's Aegean coast early Friday morning, damaging buildings and a port and killing people, authorities said. (Kalymnos-news.gr via AP)

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People look at a damaged building after an earthquake on the Greek island of Kos early Friday, July 21, 2017. A powerful earthquake struck Turkey's Aegean coast and nearby Greek islands, sending frightened residents running out of buildings they feared would collapse and into the streets. (Kalymnos-news.gr via AP)

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Firefighters and rescuers try to clean a road from the stones after an earthquake on the Greek island of Kos early Friday, July 21, 2017. A powerful earthquake struck Greek islands and Turkey's Aegean coast early Friday morning, damaging buildings and a port and killing at least two people, authorities said. (Kostoday.gr via AP)

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A man walks near a damaged building after an earthquake on the Greek island of Kos early Friday, July 21, 2017. A powerful earthquake struck Greek islands and Turkey's Aegean coast early Friday morning, damaging buildings and a port and killing people, authorities said. (Kalymnos-news.gr via AP)

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Damage and flooding are seen on a coastal road following a strong earthquake on the Greek island of Kos early Friday, July 21, 2017. A powerful earthquake struck Turkey's Aegean coast and nearby Greek islands, sending frightened residents running out of buildings they feared would collapse and into the streets. (Sander van Deventer via AP)

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A man lies on the ground as other tourists stand outside a bar after an earthquake on the Greek island of Kos early Friday, July 21, 2017. A powerful earthquake struck Greek islands and Turkey's Aegean coast early Friday morning, damaging buildings and a port and killing at least two people, authorities said. (Kostoday.gr via AP)

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Residents sleep in a public square following a strong earthquake on the Greek island of Kos early Friday, July 21, 2017. A powerful earthquake shook the Greek resort island of Kos overnight, damaging older buildings and the main port, killing at least two people and causing more than 120 injuries. (Kalymnos-news.gr via AP)

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Damage and flooding are seen on a coastal road following a strong earthquake on the Greek island of Kos early Friday, July 21, 2017. A powerful earthquake struck Turkey's Aegean coast and nearby Greek islands, sending frightened residents running out of buildings they feared would collapse and into the streets. (Sander van Deventer via AP)

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A cafe setting is littered with rubble following a strong earthquake on the Greek island of Kos early Friday, July 21, 2017. A powerful earthquake struck Turkey's Aegean coast and nearby Greek islands, sending frightened residents running out of buildings they feared would collapse and into the streets. (Sander van Deventer via AP)

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Hotel guests sleep outdoors after abandoning their rooms following an earthquake in Bitez, a resort town about 6 kilometers (4 miles) west of Bodrum, Turkey, early Friday, July 21, 2017. A powerful earthquake struck Turkey's Aegean coast and nearby Greek islands, sending frightened residents running out of buildings they feared would collapse and into the streets. (AP Photo/Ayse Wieting)

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Hotel guests sleep outdoors after abandoning their rooms following an earthquake in Bitez, a resort town about 6 kilometers (4 miles) west of Bodrum, Turkey, early Friday, July 21, 2017. A powerful earthquake struck Turkey's Aegean coast and nearby Greek islands, sending frightened residents running out of buildings they feared would collapse and into the streets. (AP Photo/Ayse Wieting)

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A man sleeps on the beachfront after spending the night outdoors following an earthquake in Bitez, a resort town about 6 kilometers (4 miles) west of Bodrum, Turkey, Friday, July 21, 2017. A powerful earthquake struck Turkey's Aegean coast and nearby Greek islands, sending frightened residents running out of buildings they feared would collapse and into the streets. (AP Photo/Ayse Wieting)