The explosion occurred at 11:30 am on a remote road in Sunga Baru village in Tambon Klongmai in Yarang district.
Sgt Kongsing Jamnamkapha, 49, suffered cuts on his head and body and died on his way to the Yarang Hospital. Private Songkran Promtrai, 21, was severely injured.
Kongsing and Songkran were riding the same motorcycle in a unit of six rangers on three motorcycles. The unit was patrolling the road.
Insurgents detonated the bomb with a wired remote.
The Nation