All 66 people on the plane were killed when the Airbus 320 crashed in the Mediterranean
An Egyptian forensic official says human remains from the crashed EgyptAir flight indicate there had been an explosion on board.
The official is part of the Egyptian investigative team and has personally examined the remains at a Cairo morgue.
He said all 80 pieces brought to Cairo so far are small and that "there isn't even a whole body part, like an arm or a head".
The official added that "the logical explanation is that it was an explosion" but no traces of explosives have been found.
However, another forensics official said only a tiny number of remains had arrived so far and it was too early to specify whether there had been a bomb on board.
All 66 people on the plane were killed when the Airbus 320 crashed in the Mediterranean on May 19th while en route from Paris to Cairo.
Egypt's president said on Sunday a submarine had been deployed in the hunt for Flight 804's black boxes.
The aircraft came down at 2.45am local time south of the Greek island of Karpathos and north of the Egyptian coast.
Ships and planes from Britain, Cyprus, France, Greece and the United States are also taking part in the search for debris.
Funerals have been held for some of the crash victims and on Tuesday family members arrived at Cairo's morgue to give DNA samples to help identify the remains.
Egyptian authorities have said they believe terrorism is a more likely explanation than equipment failure, and some aviation experts have said the erratic flight reported by the Greek defence minister suggests a bomb blast or a struggle in the cockpit.