MBANGA-PONGO, Cameroon -- The searchers drove as far as they could into the swamp and then set out on foot, crawling over soggy earth until they found signs of so many lost lives.
A white tennis shoe. A black purse of braided leather. A length of orange and blue cloth that a woman might have worn as a skirt. Unrecognizable, shredded debris hanging from trees.
Crash investigators were combing through the wreckage of Kenya Airways Flight 507 on Monday, concentrating on the possibility that the jet lost power in both engines during a storm and tried to glide back to the airport before plunging nose-first into a mangrove swamp.
All 114 people on board were killed.
Members of the recovery team - some soldiers in camouflage and red berets, others barefoot villagers in shorts and T-shirts - used branches as walking sticks during the 20-minute hike to the site. Workers placed bodies and body parts found nearby on stretchers and carried them to waiting ambulance. Trees had been chopped down and placed over puddles to make the walk easier.
The Nairobi-bound Boeing 737-800 sent a distress signal shortly after takeoff Saturday from Douala, delayed an hour by storms, and then lost contact 11-13 minutes later. It took more than 40 hours to locate the wreckage, most of it submerged in murky orange-brown water and concealed by a thick canopy of trees.
"The plane fell head first. Its nose was buried in the mangrove swamp," said Thomas Sobakam, chief of meteorology for the Douala airport. He said the plane disintegrated on impact.
The early investigation is focusing on a theory that the plane lost power in both engines but did not have enough altitude to glide back to the airport, a source close to the airline's investigation in Kenya, who spoke on condition of anonymity because he is not authorized to speak to the press.
A Cameroonian coast guard official helping lead the recovery operation said late Monday one of the plane's two black boxes had been found, a development that could help investigators determine what happened on the flight. It was not clear whether it was the data recorder or the cockpit voice recorder, or what condition it was in. The official, Capt. Francis Ekosso, did not immediately have further details.
The wreckage was found late Sunday along the plane's expected flight path. Procedures for losing all power in an aircraft call for the pilot to try to return to the airport along the same path. A nosedive crash also is consistent with a plane stalling as a pilot desperately tries to coax the plane farther along the glide path.
There were no survivors, said Luc Ndjodo, a local government official.
"We assume that a large part of the plane is underwater," said Ndjodo. "I saw only pieces.
Debris at the crash site is spread over a small area roughly the size of a soccer field.
"It's a scene of horror," said Bernard Atebede, prefect of the nearby town of Vouri. "I saw things that should never be seen. It makes you realize the fragility of life."
He said 20 bodies have been recovered, and DNA testing would be used to determine the identities of some.
Among the 105 passengers on board was Nairobi-based Associated Press correspondent Anthony Mitchell, 39, who had been on assignment in the region. Nine crew members also were on board.
Initially, the search focused on the rugged, forested area near the town of Lolodorf, about 140 kilometers (90 miles) southeast of Douala. Sobakam said officials were led astray by an incorrect satellite signal, possibly emitted from the plane.
Crash investigators concentrated Monday on the possibility that a Kenya Airways jetliner lost power in both engines during a storm.
"Whatever happened must have happened very fast, which is usually a sign of catastrophic structural failure," said Patrick Smith, a U.S. based-airline pilot and aviation expert.