Human remains retrieved from the crashed EgyptAir flight suggest that there was an explosion on board the plane, although no traces of explosives have been detected, an Egyptian forensics official and investigation sources said on Tuesday."The size of the remains points towards an explosion, the biggest part was the size of a palm," the forensics official said.However, the head of Egypt’s Forensic Authority, Hesham Abdelhamid, called the reports “mere assumptions” that do not reflect any official position from investigators. All 66 people onboard were killed when Flight MS804 crashed last Thursday.