Crews hunt for debris and black box from doomed EgyptAir jet

The Imam of al Thawrah Mosque, Samir Abdel Bary, gives condolences to Tarek Abu Laban, center, who lost four relatives, all victims of Thursday's EgyptAir plane crash, following prayers for the dead, at al Thawrah Mosque, in Cairo, Egypt, Friday, May 20, 2016. The Airbus A320 plane was flying from Paris to Cairo with 66 passengers and crew when it disappeared early Thursday over the Mediterranean Sea. (AP Photo/Amr Nabil) (The Associated Press)

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This picture posted Saturday, May 21, 2016, on the official Facebook page of the Egyptian Armed Forces spokesman shows part of the wreckage from EgyptAir flight 804. Search crews found floating human remains, luggage and seats from the doomed EgyptAir jetliner Friday but face a potentially more complex task in locating bigger pieces of wreckage and the black boxes vital to determining why the plane plunged into the Mediterranean. Arabic reads: “ Part of plane wreckage”. (Egyptian Armed Forces Facebook via AP) (The Associated Press)

This picture posted Saturday, May 21, 2016, on the official Facebook page of the Egyptian Armed Forces spokesman shows part of a plane chair from EgyptAir flight 804. Search crews found floating human remains, luggage and seats from the doomed EgyptAir jetliner Friday but face a potentially more complex task in locating bigger pieces of wreckage and the black boxes vital to determining why the plane plunged into the Mediterranean. Arabic reads: “ Part of plane chair”. (Egyptian Armed Forces via AP) (The Associated Press)

CAIRO – 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.