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Relatives and friends of EgyptAir hostess Yara Hani (portrait), who was onboard Flight MS804 from Paris to Cairo shortly before it plunged into the Mediterranean, mourn during a ceremony at a church in Cairo on May 21, 2016. Smoke was detected inside an EgyptAir plane shortly before it plunged into the Mediterranean with 66 people on board, investigators said, offering clues but no answers about why it crashed. The Airbus A320 had been flying from Paris to Cairo early Thursday when it plummeted and turned full circle before vanishing from radar screens, without its crew sending a distress signal. / AFP / STR (Photo credit should read STR/AFP via Getty Images)