An EgyptAir flight MS804 from Paris to Cairo has crashed into the sea with 66 people on board.
The Airbus A320 "turned 90 degrees left and then a 360-degree turn to the right" before crashing into the Mediterranean Sea, a report by the BBC said, citing Greece defence minister, Panos Kammenos
The plane then dropped more than 25,000ft (7,620m) before disappearing from radar, the report added.
Egypt's civil aviation minister also said that the possibility of a terror attack was "stronger" than technical failure.
Sherif Fathi added that no wreckage had yet been found but latest reports suggest search teams have sighted debris from the plane.
The Airbus A320 went missing over the eastern Mediterranean, soon after entering Egyptian airspace.
EgyptAir says it received a distress signal before the plane disappeared from radar.
There were 56 passengers - including three children - seven crew members and three security personnel on board Flight MS804, the report said.
The passengers are said to include 30 Egyptians, 15 French citizens, one Briton, two Iraqis, as well as people from Canada, Belgium, Kuwait, Saudi Arabia, Algeria, Sudan, Chad and Portugal.
A video surfaced shortly after the tragedy as the first news started flowing in, but was quickly reported to be an older video from 2015.