CAIRO — An EgyptAir jetliner bound from Paris to Cairo with 66 people aboard crashed in the Mediterranean Sea early Thursday after swerving wildly in flight, authorities said, and Egypt said it may have been a terrorist attack.

There were no immediate signs of survivors.

EgyptAir Flight 804, an Airbus A320 with 56 passengers and 10 crew members, went down about halfway between the Greek island of Crete and Egypt's coastline after takeoff from Charles de Gaulle Airport, authorities said.