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The permanent secretary of the Thai defence ministry, Mr Nipat Thonglek, told AFP that he had been informed of the deaths by a senior Lao military official and would attend the defence minister's funeral on behalf of Thailand.
The plane took off from the capital, Vientiane, early Saturday morning and crashed in the northeastern province of Xiangkhoung, about 470 kilometers (290 miles) away.
The aircraft was carrying Defense Minister Douangchay Phichit, who is also a deputy prime minister, and several other high-ranking officials, including the governor of Vientiane, the capital.
They were heading to an official ceremony for the Ministry of Defense, said Sek, who was informed of the crash by authorities in neighboring Laos.
He did not immediately have any other details, and there was no official statement on the crash from authorities in Laos, which is ruled by a secretive Communist Party.
In October, a Lao Airlines ATR-72 turboprop crashed during a heavy storm as it approached Pakse Airport in southern Laos, killing all 49 people on board.