Sources say hunt for black boxes makes key progress

Black boxes located in search for EgyptAir wreckage

ALEXANDRIA, Egypt -- Search crews located the data recorders for EgyptAir Flight 804 close to an area where human remains and debris from the crashed flight have been found, an Egyptian government source told CBS News on Saturday.

New developments in EgyptAir crash probe

Egyptian media, including state media, were reporting the same development, CBS News correspondent Holly Williams reports.

Late Saturday, a U.S. intelligence source confirmed to CBS News the data recorders, commonly known as black boxes, have been approximately located by their pings and that recovery efforts were underway.

There has been no official confirmation, and EgyptAir wouldn't confirm or deny that the black boxes have been located, Williams reports.

Also Saturday, the French air accident investigation agency said smoke was detected in multiple places on the flight moments before it plummeted into the Mediterranean, but the cause of the crash that killed all 66 on board remains unclear.

Sebastien Barthe, a spokesman for the French agency, told The Associated Press in Paris that the plane's automatic detection system sent messages indicating smoke a few minutes before the plane disappeared from radar while flying over the east Mediterranean early on Thursday morning.

Smoke detected on EgyptAir flight before crash

The messages, he explained, "generally mean the start of a fire," but he added: "We are drawing no conclusions from this. Everything else is pure conjecture."

Barthe's disclosure of smoke detection aboard the flight followed a report by an industry publication that sensors detected smoke in a lavatory, suggesting a fire started onboard before the aircraft went down.

The publication cited information transmitted through the plane's Aircraft Communications Addressing and Reporting System, or ACARS, which transmits data from the plane to the ground in the form of a series of messages. Those messages showed that smoke was detected in the plane's lavatory near the cockpit, according to the report.

David Learmount, a widely respected aviation expert and editor of the authoritative Flightglobal magazine, said the readings reported by the Aviation Herald suggested a quick-spreading fire.

Juan Zarate on EgyptAir disaster

"The question now is whether the fire that caused the smoke was the result of an electrical fault - for example a short-circuit caused by damaged wiring - or whether some form of explosive or incendiary device was used," he wrote on his website.

In the absence of a claim of responsibility, it's still unclear whether the crash was the result of a fault or an attack, he wrote.

"That answer is unlikely to be forthcoming soon."

Another aviation expert, Egyptian Hossam Elhamy Shaker, said the detection of smoke does not solve the mystery of the crash. "It just leads us into an area where smoke is a major contributor to the incident, either by destroying the aircraft's equipment or suffocating the pilots," he told the AP.

EgyptAir crash prompts France to strengthen airport security

Looking for clues to whether terrorists may have brought down the Airbus A320, investigators have been poring over the passenger list and questioned ground crew members at Charles de Gaulle Airport in Paris, from which the plane took off.

The aircraft had been cruising normally in clear skies on a nighttime flight to Cairo early Thursday when it suddenly lurched left, then right, spun all the way around and plummeted 38,000 feet into the sea, never issuing a distress signal.

The first available audio from the doomed flight indicates that all was routine as the pilot checked in with air traffic controllers in Zurich, Switzerland, around midnight, before being handed over to Italian air traffic controllers in Padua (Padova): Pilot - "This is 0-7-2-5 Padova control. (Unintelligible) 8-0-4. Thank you so much. Good day er good night."

The communication, taken from liveatc.net which provides live air traffic control broadcasts from around the world, occurred about 2 ½ hours before Greek air traffic controllers lost contact with the plane.

Search crews are scouring for further wreckage of the aircraft. Experts said answers will come only with an examination of the wreckage and the plane's black boxes.

Planes and vessels from Egypt and five other countries - Greece, Britain, France, the United States and Cyprus - continued searching a wide area of the eastern Mediterranean on Saturday, a day after the Egyptian military found debris from the passenger jet in the sea 180 miles north of the Egyptian port city of Alexandria.

The waters in the area are 8,000 to 10,000 feet deep, and the pings from the black boxes can be detected up to a depth of 20,000 feet.

On Saturday, the Egyptian military released photographs of the debris. The photos were posted on the Facebook page of the chief military spokesman. They appear to show the heavily damaged remains of plane seats, life jackets - one of which was seemingly undamaged - and a scrap of cloth that looks to be part of a baby's purple and pink blanket or sleeping bag.

The spokesman's Facebook page later posted a brief video that showed more debris, including what appeared to be a piece of blue carpet, seat belts, a shoe and what looked like a woman's white handbag. The short clip opened with aerial footage of an unidentified navy ship followed by a speed boat with five service members aboard heading toward floating debris.

EgyptAir crash prompts closer look at airport security

Egyptian authorities said they believe terrorism is a more likely explanation than equipment failure, and some aviation experts have said the erratic flight suggests a bomb blast or a struggle in the cockpit. But so far no hard evidence has emerged.

No militant group has claimed to have brought down the aircraft. That is a contrast to the downing of a Russian jet in October over Egypt's Sinai Peninsula that killed all 224 on board. In that case, the Sinai branch of the Islamic State of Iraq and Syria, or ISIS, issued a claim of responsibility within hours. On Friday, ISIS issued a statement on clashes with the Egyptian military in Sinai, but said nothing about the plane crash.

Three European security officials said on Friday that the passenger manifest for Flight 804 contained no names on terrorism watch lists. The officials spoke to the AP on condition of anonymity because they were not authorized to discuss the investigation. The manifest was leaked online and has not been verified by the airline.

Further checks are being conducted on relatives of the passengers.

Egyptian military says EgyptAir Flight 804 debris found

French aviation investigators have begun to check and question all baggage handlers, maintenance workers, gate agents and other ground crew members at Charles de Gaulle Airport who had a direct or indirect link to the plane before it took off, according to a French judicial official. The official was not authorized to discuss the investigation and spoke to the AP on condition of anonymity.

Whatever caused the aircraft to crash, the tragedy will most likely deepen Egypt's difficult predicament as it struggles to revive a battered economy and contain an increasingly resilient insurgency by Islamic militants.

In the five years since the country was first mired in turmoil caused by a popular uprising against longtime autocrat Hosni Mubarak, the lucrative tourism sector has been decimated, the value of the local currency has progressively fallen and domestic debt has mushroomed.

What would help determine whether EgyptAir crash was terrorism?

While the latest tragedy may not reflect directly on security at Egypt's airports, as the Russian jet crash did in October, the country's association with another air disaster will impact negatively on tourism and the flow of foreign investment.

In Paris, French Foreign Minister Jean-Marc Ayrault said Saturday that he and other officials - including representatives of Paris Aeroport, the French prosecutor, EgyptAir, and the Egyptian ambassador to Paris - had met with about 100 family members to express "our profound compassion" over the crash.

In a statement delivered to reporters following the meeting, he said: "All the hypotheses are being examined - none are being favored."

"In the name of France, once more, I am expressing my solidarity, but also our affection ... for all those people who learned that a loved one, or even an entire family, have drowned in the sea - and who want to know, to know to be able to grieve. It's a difficult moment, a painful moment. I wanted to say it again: We're on their side."

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