An EgyptAir jet carrying 66 passengers and crew from Paris to Cairo disappeared from radar over the Mediterranean sea on Thursday after swerving in mid-air and plunging from cruising height. French President Francois Hollande confirmed the aircraft "came down and is lost".
Egyptian Prime Minister Sherif Ismail announced a search was under way for the missing Airbus A320 but it was too early to rule out any explanation, including an attack like the one blamed for bringing down a Russian airliner over Egypt's Sinai peninsula last year.
Officials with the airline and the Egyptian civil aviation department told Reuters they believed the Airbus had crashed into the Mediterranean between Greece and Egypt.
In Athens, Greek Defence Minister Panos Kammenos said the Airbus had first swerved 90 degrees to the left, then spun through 360 degrees to the right. After plunging from 37,000 feet to 15,000, it vanished from Greek radar screens.
Greece deployed aircraft and a frigate to the area to help with the search. A defence ministry source said authorities were also investigating an account from the captain of a merchant ship who reported a 'flame in the sky' about 130 nautical miles south of the island of Karpathos.
According to Greece's civil aviation chief, calls from Greek air traffic controllers to the jet went unanswered just before it left the country's airspace, and it disappeared from radar screens soon afterwards.
By early afternoon, the search in the Mediterranean had yet to turn up anything. "Absolutely nothing has been found so far," a senior Greek coastguard official told Reuters.
There was no official suggestion of whether the disappearance was due to technical failure or any other reason such as sabotage by ultra-hardline Islamists, who have targeted airports, airliners and tourist sites in Europe, Egypt, Tunisia and other Middle Eastern countries over the past few years.
The aircraft was carrying 56 passengers - with one child and two infants among them - and 10 crew, EgyptAir said. They included 30 Egyptian and 15 French nationals, along with citizens of 10 other countries.
Asked if he could rule out that terrorists were behind the incident, Prime Minister Ismail told reporters: "We cannot exclude anything at this time or confirm anything. All the search operations must be concluded so we can know the cause."
In Paris, Hollande also said the cause remained unknown. "Unfortunately the information we have ... confirms to us that the plane came down and is lost," he said. "No hypothesis can be ruled out, nor can any be favoured over another."
With its archeological sites and Red Sea resorts, Egypt is traditionally a popular destination for Western tourists. But the industry has been badly hit following the downing of the Russian Metrojet flight last October, killing all 224 people on board, as well as by an Islamist insurgency and a string of bomb attacks.
Greek air traffic controllers spoke to the pilot as the jet flew over the island of Kea, in what was thought to be the last broadcast from the aircraft, and no problems were reported.
But just ahead of the handover to Cairo airspace, calls to the plane went unanswered, before it dropped off radars shortly after exiting Greek airspace, Kostas Litzerakis, the head of Greece's civil aviation department, told Reuters.
"During the transfer procedure to Cairo airspace, about seven miles before the aircraft entered the Cairo airspace, Greek controllers tried to contact the pilot but he was not responding," he said.
Greek authorities are searching in the area south of the island of Karpathos without result so far, Defence Minister Kammenos told a news conference.
"At 3.39am (0039 GMT) the course of the aircraft was south and south-east of Kassos and Karpathos (islands)," he said. "Immediately after, it entered Cairo FIR (flight information region) and made swerves and a descent I describe: 90 degrees left and then 360 degrees to the right."
The Airbus plunged from 37,000 feet (11,280 metres) to 15,000 feet before vanishing from radar, he added.
Egyptian Civil Aviation minister Sherif Fathi said authorities had tried to resume contact but without success.
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