Traces of explosives have been found on victims of the EgyptAir plane that crashed into the Mediterranean in May, Egyptian investigators say.
A criminal investigation would now begin into the crash of the Airbus A320, the civil aviation ministry said.
Flight MS804 from Paris to Cairo plunged into the sea on 19 May killing all 66 people on board.
A source close to the French investigation says they have doubts about Egypt's latest findings.
They told the BBC there had been "difficulties" working with the Egyptian authorities and that their main concern was to see the remains of the French victims returned to France.
The plane had been carrying 40 Egyptians, including the 10-member crew, and 15 French nationals.