(Bloomberg) -- Terrorism is a more probable cause of the EgyptAir crash than a mechanical fault, a senior Egyptian official said hours after the jetliner plunged into the eastern Mediterranean Sea with 66 people on board.

“The possibility of terrorist attack is higher than technical failure, but it is still speculation and assumptions,” Civil Aviation Minister Sherif Fathy said in a televised news conference in Cairo, where the plane had been due to land after completing its flight from Paris.

French President Francois Hollande, whose country has been under its highest level of alert since terror attacks last year, said no hypotheses were being ruled out, and French prosecutors opened a probe since the plane’s last flight left from France. Greek officials said debris had been found near where the plane was last detected, though they couldn’t confirm if it was from flight MS804. A French military Falcon 50 plane is also participating in the search, French officials said.

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