Rescue workers investigate the crash site of a Kenya Airways plane at Mbanga Pongo, Cameroon. Crash investigators concentrated Monday on the possibility that a Kenya Airways jetliner lost power in both engines during a storm and tried to glide back before plunging nose first into a mangrove swamp 12 miles from the airport. All 114 people on board were killed in the crash early Saturday, officials said.

Mbanga-Pongo, Cameroon ? Investigators focused Monday on the possibility a Kenya Airways jetliner lost power in both engines during a storm just after takeoff and was trying to glide back to the airport when it plunged into a mangrove swamp 12 miles from the runway.

All 114 people on board were killed in the crash, officials in this West African nation said after picking their way along a muddy path to the site strewn with pieces of metal, bodies and shoes.

After being delayed an hour by storms, the Kenya-bound Boeing 737-800 sent a distress signal shortly after takeoff from Douala early Saturday, then lost contact 11 to 13 minutes later. It took searchers more than 40 hours to find the wreckage, most of it submerged in murky orange-brown water and concealed by a 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 jet disintegrated on impact.

There were no survivors, said Luc Ndjodo, a local official. “We assume that a large part of the plane is under water. I saw only pieces.”

A coast guard officer, Capt. Francis Ekosso, said late Monday that one of the two flight recorders had been found, a development that could help investigators determine what happened to Flight 507. He did not know the device’s condition or whether it was the data recorder or the cockpit voice recorder.

Officials said it was too early to tell what caused the crash, but investigators concentrated on the stormy weather as a possible contributor.

Experts were considering a theory the jet’s two engines flamed out because of the weather and the craft did not have enough altitude to glide back to the airport, said an official close to the airline’s investigation in Kenya’s capital, Nairobi. He agreed to discuss the matter only if not quoted by name because he was not authorized to speak to the media.

The wreckage was found late Sunday along the plane’s expected flight path.