Egypt's military displayed wreckage and personal belongings found in the search for EgyptAir Flight 804 as searchers scoured the Mediterranean Sea on Saturday for the aircraft's flight data and cockpit voice recorders.
The chunks of debris included an uninflated life vest, a seat, a purse, shoes, carpet, a scarf, parts of chairs and cushions, and a sling bag.
The EgyptAir label appeared on one piece of wreckage.
On Friday, EgyptAir and Greek officials said that searchers found seats, suitcases and personal belongings.
Greek Defense Minister Panos Kammenos relayed the Egyptian discovery of a body part. The Egyptian military said it found debris about 290 kilometers (180 miles) north of Alexandria, Egypt.
No survivors have been found. Egyptian officials have said they suspect the crash was caused by an act of terror, but no group has come forward to claim credit.
French Foreign Minister Jean-Marc Ayrault told passengers' families Saturday that "no theory" has been ruled out.
The Airbus A320 carried 56 passengers and 10 crew members and security when it left Charles de Gaulle Airport in Paris late Wednesday headed for Cairo.
Most of the passengers were Egyptian -- 30 in all.
Also aboard were 15 French citizens, including an infant, and passengers from Iraq, Britain, Belgium, Kuwait, Saudi Arabia, Sudan, Chad, Portugal, Canada and Algeria, according to Sharif Fathi, Egypt's aviation minister.
Automatic messages about smoke
In France, aviation officials revealed Saturday that the plane sent automatic messages about smoke in the front of the aircraft just before it crashed early Thursday.
France's revelation confirmed flight data that CNN obtained from an Egyptian source a day earlier.
That flight data indicated smoke alerts occurred near the cockpit minutes before the crash.
The data came through the Aircraft Communications Addressing and Reporting System, or ACARS, which sends messages between planes and ground facilities. A screen grab of data has time stamps that match the approximate time the aircraft went missing.
BEA, France's accident investigation agency, "can confirm that the aircraft sent automatic ACARS messages about smoke in the front of the aircraft," spokesman Sebastian Barthe said Saturday.
Barthe said he cannot confirm the cause of the smoke or its origins.
The alerts don't necessarily mean a fire occurred on the plane or that the crew even knew about the alerts, which are automatically transmitted, aviation experts cautioned.
"(The data) doesn't tell us anything, whether it's an explosion because of a bomb or because of a mechanical fault, but immediately it narrows down the area that we're looking at," CNN aviation analyst Richard Quest said.
"We're now no longer worried about wings or what else might have happened, or other flight control surfaces."
Data sent over a few minutes
Aviation experts held different views of what the data may signify.
There were indications of problems with a heated window in the cockpit, a sliding window in the cockpit, smoke in the lavatory, smoke in the avionics compartment below the cockpit, a fixed window, the autopilot and the flight control system.
"It could have been either something mechanical that had failed, a short circuit, or it could have been an incendiary device of some kind as well," CNN aviation analyst David Soucie said.
He said it was significant that the data was sent over a period of one to two minutes.
"Now if it was a bomb, the characteristic bomb ... (it) would have ruptured the skin of the aircraft," Soucie said. "This is not the indication you would have had, because a bomb that would do that would be instantaneous, and these reports would not have gone over two minutes like they do."
The ACARS data, however, could be consistent with a catastrophic failure -- be it from an intentional act or mechanical breakdown, according to an aviation official and a former Federal Aviation Administration official.
The aviation official said if there were a fire on board a plane, it would tend to burn slow enough for pilots to send an emergency message. These messages could have been a result of wires shorting out and malfunctioning as the plane broke apart.
The aviation official said the messages, while random, would be consistent with what a system would send on a plane falling apart.
There have been electrical problems with window anti-ice heaters in A320s. In 2003, the FAA required windshields replaced in all A320s in the United States. It's not known whether Egypt followed the FAA directive.
What went wrong?
The plane disappeared from radar early Thursday as it flew to Cairo in what should have been about a 3½-hour flight.
At some point before dropping off radar, the plane swerved 90 degrees to the left and then made a 360-degree turn to the right before plunging first to 15,000 feet, then 10,000 feet, and disappearing from radar, Greek officials said.
That sudden change in what had been an uneventful flight is why Egyptian officials are focusing on terror as the likely cause, a senior Egyptian official told CNN on Friday.
What Greek officials described as swerving were likely pieces of the aircraft being picked up on radar as they fell from the sky, U.S. officials told CNN.
As of now, investigators have found nothing implicating the flight crew or security officials aboard the plane, the Egyptian official said.
Checks of the passenger manifest have so far resulted in no hits on terror watch lists, officials with knowledge of the investigation said.
The jet had routine maintenance checks in Cairo before it left for Paris, the airline said. Earlier Wednesday, the jet was also in Eritrea and Tunisia, data from flight tracking websites show.
Greece, France, the United States and other nations were searching about 130 nautical miles southeast of the Greek island of Karpathos, Greek aviation officials said.
The European Space Agency said Friday that its Sentinel-1A satellite had spotted an oil slick near where the plane is believed to have crashed. The agency said it's possible the slick could be from another source.
The crucial cockpit voice recorder and flight data recorder -- the so-called black boxes -- have yet to be located.
As crews searched, somber relatives gathered in Cairo and Paris airports, seeking word on their loved ones.
The Egyptian Civil Aviation Ministry has formed an investigative committee for the crash led by Ayman al-Moqadem, the investigator also in charge of the inquiry into the October crash of a Russian Metrojet airliner over the Sinai. That disaster, which killed all 224 aboard, is widely believed to be the work of terrorists.