Egyptian investigators say wreckage from the EgyptAir flight that crashed in May shows "signs of damage because of high temperature" and a flight data recorder indicates there was smoke on board.

The flight from Paris to Cairo crashed into the Mediterranean on May 19 for reasons that remain unknown. The pilots made no distress call, and no militant group has claimed to have brought down the plane.

The Egyptian investigating committee said in a statement Wednesday that a recovered flight data recorder, one of the plane's black boxes, showed that there was smoke in the lavatory and onboard equipment.

The second black box, a cockpit recorder, was damaged in the crash and is being repaired in Paris. The wreckage was recovered from the Mediterranean Sea floor earlier this month.