LOLODORF, Cameroon --
Rescuers searched a densely forested region overnight in southern Cameroon for a Kenya-bound flight that crashed with 114 people on board after sending out a distress signal, officials said.
The jet bound for the Kenyan capital, Nairobi, went down early Saturday near Lolodorf, a town about 90 miles (150 kilometers) southeast of the coastal city of Douala, where it had taken off after midnight, said Alex Bayeck, a regional communications officer.
There was no word on survivors, Bayeck said by telephone en route to the crash site.
On Saturday, search planes flew over the forested area where the airliner gave off a distress signal, but no wreckage has been spotted.
The search continued on the ground through the night, but helicopters could not operate effectively in the dark, said Jean Francois Villong, a local official coordinating the rescue effort. The helicopters would start again Sunday morning, he said, and more rescue workers including security forces were expected. Much of Saturday's searching was done by volunteers from local villages, he said.
"It is very difficult because this area is very mountainous and heavily forested. And we suspect the plane may have fallen into a valley," Villong said.
Residents in the area, which has few roads and is dotted by small villages, reported hearing a "large boom" during the previous night, Bayeck said, and some people said they saw a flash of fire that looked markedly different from lightning.
Close to a dozen ambulances stood ready in Lolodorf on Saturday, and a handful of family members of passengers gathered in the city center. Some said they had traveled as far as 250 miles (400 kilometers) that day.
"I don't know what to do. I'm just terribly confused. My younger sister boarded this plane that is supposed to have crashed. I hope we can still find her alive," said Innocent Bonu, a lawyer from the southwestern town of Buea.
Kenya Airways CEO Titus Naikuni held back on confirming the crash "until we see the plane - until then, it's missing," he said.
He said the distress call was issued automatically - "from a machine, not a pilot" - but said a crash is not the only reason a plane issues an automatic distress signal.
Boeing spokesman Jim Proulx said the plane that crashed was equipped with an emergency transmitter that sends out an automatic locator signal "in the event of a rapid change in velocity."
Proulx told The Associated Press by telephone from Seattle, Washington, that the transmitter would have been activated upon impact, and can also be manually turned on by the plane's flight crew.
Naikuni said the plane, which was almost new, took off an hour late because of rain. Douala airport officials confirmed thunderstorms at the time of takeoff, but said that was unlikely to have been the sole cause of the accident.
"There was a thunderstorm, but there were other planes that left after (the Kenya Airways flight to Nairobi) that had no problems," said Thomas Sobatam, head of weather observation at the airport.
Kenya's transport minister, Ali Chirau Makwere, said it was too early to determine what happened.
"We need to get information from the technical experts as to whether it was occasioned by the weather or pilot error or mechanical fault," he said in Nairobi. "We really don't know. It's too early to make any conclusions."
The Boeing 737-800 was carrying 114 people, including 105 passengers from at least 23 countries, Kenyan airline officials said. A Nairobi-based Associated Press correspondent, Anthony Mitchell, was believed to be among them. Mitchell had been on assignment in the region for the past week.
"Anthony ... had contacted his family before boarding the flight to let them know he was headed home," AP Executive Editor Kathleen Carroll said. "We hope for the best."
Relatives at Nairobi's airport began wailing as news reports of the crash filtered in. Dozens of family members collapsed in the airport terminal.
One person at the airport said families had not been given any information. "I cannot talk now because there is no news," he said, declining to give his name.
Janet Mwema went to a crisis center Kenya Airways set up at a Nairobi hotel because she believed her daughter, Vicky, a cabin crew member, might have been on the flight.
"We trust God that he will strengthen his people," Mwema said. "Because we all go one day, whether it is accident or what."
The flight departed Douala at 12:05 a.m. and was to arrive in Nairobi at 6:15 a.m. The flight originated in Ivory Coast but stopped in Cameroon to pick up more passengers, the airline said.
"The last message was received in Douala after takeoff and thereafter, the tower was unable to contact the plane," Naikuni said earlier Saturday. He said the plane was only six months old.
Kenyan government spokesman Alfred Mutua urged patience. "The area is in a very dense forest; the weather has been horrid to say the least," he said, suggesting that rain was hampering the search.
That area of Cameroon is not well-covered by radar, and investigators are having a hard time pinpointing the plane's flight path, Mutua said.
Infrastructure is poor in Cameroon's interior, with much of the area being searched only accessible by dirt tracks that turn to impassable mud in the rainy season. The country of 17 million on Africa's western coast has oil reserves and lush farmland but many of its citizens remain poor subsistence farmers.
The Douala-Nairobi flight runs several times a week and commonly is used as an intermediary flight to Europe and the Middle East. Kenya Airways - considered one of the safest airlines in Africa - said most passengers were planning to transfer to ongoing flights in Nairobi.
The U.S. National Transportation Safety Board said it was sending a team to assist the government of Cameroon in its investigation of the crash.
Proulx said there have not been any safety concerns with Chicago-based Boeing's fleet of 737-800s. About 2,000 737-800s are in use around the world.
"We express our profound concern for the passengers and crew on board on the Kenya Airways flight that went missing," Proulx said Saturday. "We stand ready to assist the authorities if they ask us to do so."
The last crash of an international Kenya Airways flight was on Jan. 30, 2000, when Flight 431 was taking off from Abidjan, Ivory Coast, on its way to Nairobi. Investigators blamed a faulty alarm and pilot error for that crash, which killed 169 people.
Associated Press writers Elizabeth A. Kennedy and Tom Maliti in Nairobi, Kenya, and Heidi Vogt in Dakar, Senegal, and Ashley Heher in Chicago contributed to this report.
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