The Latest on the crash of EgyptAir Flight 804 (all times local):

9:50 a.m.

The French air accident investigation agency says smoke was detected in multiple places in the EgyptAir Flight 804 before it crashed in the Mediterranean, but the cause remains unclear.

Spokesman Sebastien Barthe told The Associated Press that the plane's automatic detection system sent messages indicating smoke a few minutes before it disappeared from radar.

He said the messages "generally mean the start of a fire."

He adds: "We are drawing no conclusions from this. Everything else is pure conjecture."

The industry publication Aviation Herald reported Friday that sensors detected smoke in the plane's lavatory, suggesting a fire onboard.

The plane, carrying 66 people, crashed in the Mediterranean Sea on Thursday.

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7:55 a.m.

Search crews are scouring for further wreckage of EgyptAir flight 804 — including for the plane's black boxes, which could provide vital clues to why the jetliner crashed killing all 66 on board.

Planes and vessels from Egypt and five other countries are searching a wide area of the Mediterranean Saturday, a day after the Egyptian army found debris from the Airbus 320 in the sea 180 miles (290 kilometers) north of Alexandria.

No hard evidence has emerged to why the plane dropped off radar, swerved wildly and plummeted early Thursday morning.

Investigators are considering the possibility of a terror attack. No militant group claims to have brought down the plane.

The industry publication Aviation Herald reports that sensors detected smoke in the plane's lavatory, suggesting a fire onboard.