Thai soldiers watch as a forensic unit inspects the scene of an attack following two roadside bomb blasts at four separate locations by suspected separatist militants in the Bacho district of Thailand's restive southern province of Narathiwat on August 15, 2016. PHOTO: AFP
The UH-72 helicopter lost contact on Sunday while returning from Pai district in the mountainous northwest where it had been conducting flood relief operations, said junta spokesman Colonel Winthai Suvaree.
Thailand's deep south hit by fresh blasts
The northwest has suffered flash floods caused by heavy rainfall.
Major General Nopporn Ruanchan, commander of the army's 4th Infantry Division, was on board the helicopter along with two pilots and two technicians.
All were killed in the crash, Winthai added.
The helicopter came down near the city of Chiang Mai, close to Thailand's highest peak -- a region that is difficult to access.
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