Search crews locate black boxes for EgyptAir Flight 804

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CBS NEWS - Search crews have located the data recorders for EgyptAir Flight 804 close to an area where human remains and debris from the crashed flight have been found, Egyptian government sources confirmed to CBS News.

On Friday, sources told CBS News that information was transmitted from the flight indicating that smoke was detected on the plane before it crashed.

According to the sources, the information indicates smoke was coming from one of the engines. The data was transmitted through the Aircraft Communications Addressing and Reporting System, which sends snapshots of engine performance throughout the flight.

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.

Experts said answers will come only with an examination of the wreckage and the plane's cockpit voice and flight data recorders, commonly known as 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 posted new photos of debris on its spokesman's Facebook page. They included what appeared to be parts of a seat, a lifejacket and what looks to be a pink and purple children's blanket.

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 Associated Press 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.

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 very likely deepen Egypt's difficult predicament as the country of some 90 million people 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 longstanding dictator Hosni Mubarak, the lucrative tourism sector has been decimated, the value of the local currency has progressively fallen and domestic debt has mushroomed.

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 was meeting Saturday with family members of the passengers and crew aboard the EgyptAir flight.

Ayrault, who is being joined by diplomats and investigators, said Friday the meeting at the Foreign Ministry would be aimed at giving family members as much information as possible.

"The whole truth, nothing but the truth," he was quoted as saying by broadcaster BFMTV. "We owe it to the families."