KAMPOT, Cambodia --
A passenger plane that disappeared in southern Cambodia likely crashed during a storm, and there is little hope of finding survivors among the 22 people who were on board, Prime Minister Hun Sen said Tuesday.
He said he has asked for the United States to use its high-tech surveillance satellites to help search for the downed plane, believed to have crashed in a mountainous jungle area.
Some 1,000 soldiers and police were combing rough terrain in Kampot province for the PMT Air plane, a Russian-made An-24 that was flying between two of the country's most popular tourist destinations when it disappeared Monday.
Hun Sen said the plane was flying in a heavy rainstorm and that there was a "high probability it may have crashed into a mountain as it was descending to land" in Sihanoukville, the plane's scheduled destination.
He said he asked U.S. Ambassador Joseph Mussomeli on Monday for the U.S. government "to redirect its satellites to help search" for the plane.
U.S. Embassy spokesman Jeff Daigle said the United States is acting on the Cambodian government's request for "satellite imagery to assist in the search for the missing plane."
"But current weather conditions in the search area are hampering our efforts," Daigle said in an e-mail.
Hun Sen visited Kampot town, about 130 kilometers (80 miles) southwest of the capital, Phnom Penh, to discuss rescue efforts with provincial and military officials.
"Although we have very little hope for any survivors, we must continue searching ... to retrieve bodies," Hun Sen said, expressing his condolences to the families of the victims.
The plane disappeared over a mountainous jungle area Monday morning as it was flying from Siem Reap - Cambodia's main tourist hub where the famous Angkor Wat temple complex is located - to Sihanoukville, on the coast.
Him Sarun, head of the Secretariat of Civil Aviation, said the aircraft is thought to have crashed between Kamchay and the Bokor mountains in Kampot province.
An official at Siem Reap airport said 13 of the passengers were from South Korea - a figure confirmed by officials in Seoul - and three were Czech. The official, who asked not to be named because he was not authorized to speak to the press, said the plane carried a crew of five Cambodians and a Russian co-pilot.
Thach Khorn, the province's governor, said the government will give a US$5,000 (euro3,700) reward to any villager who can lead rescuers to the crash site.
But more than 30 hours after the plane disappeared, rescuers still have had no luck in their search.
Heavy rains have made the terrain treacherously slippery, and some trails are so water-logged that the search teams have had to abandon their vehicles to search on foot. Fog and rain have allowed only sporadic missions by helicopters helping in the search.
Air force pilots were able to fly four helicopters Tuesday to conduct an aerial search but "they were still unable to locate the downed plane due to very bad weather," Gen. Ke Kim Yan, commander in chief of the Cambodian Armed Forces, said at a press conference in Kampot town, where he is overseeing search efforts.
PMT Air is a small Cambodia airline that began flights from Siem Reap to Sihanoukville in January, a new domestic route launched by the government to spur the country's burgeoning tourism industry.
Sar Sareth, the airline's director, said his company acquired the missing plane about two years ago from the now-defunct Royal Phnom Penh Airways, a company set up by Prince Norodom Chakrapong, a son of retired King Norodom Sihanouk.
Sar Sareth said he did not know what year the plane was built but that it was in "good condition" before taking off from Siem Reap on Monday.
"It was always in compliance with flight technical and safety procedures. But we cannot say anything yet (about the cause) because information is on the flight recorder," he said, referring to the on-board data recorder commonly known as a black box.
Information Minister Khieu Kanharith, who is also the chief government spokesman, said that finding the plane is now the main focus, and the issue of its "operating license and other technical aspects" would also be tackled later.
"We will review the extent of security and safety norms of the company," he said.
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