French Navy’s spokesman Didier Piatton said that submarines may be deployed in search for the plane’s black box.
Earlier, information agencies and TV networks reported that the plane’s debris was found south of the Greek island of Karpathos, close to the spot where a transponder signal was emitted earlier.
EgyptAir Flight MS804 departed from Charles de Gaulle Airport in Paris at 23:09 GMT. The aircraft was heading for Cairo International Airport. According to the airline, there were a total of 66 people on board the plane, including 56 passengers.
A clear statement on the reasons for the disappearance of the EgyptAir passenger jet over the Mediterranean Sea earlier on Thursday is not expected for several days, the Egyptian Civil Aviation Minister added.