Police suspected insurgents carried out the attacks in Tak Bai district ahead of the eight-year anniversary of the Tak Bai massacre on Oct 25, 2004.
The explosions took place about 9pm yesterday, though details were still coming to light at press time last night.
Police said a bomb hidden in a parked car exploded in front of Tak Bai Plaza hotel and another bomb hidden in a parked motorcycle later exploded in front of the Sodsai karaoke bar, located 100m from the hotel. The third explosion took place inside the V grocery shop in the district's downtown area.
Police said southern insurgents also sprayed bullets into a marine police camp.
The officers inside briefly exchanged gunfire with the perpetrators, killing one of them at the scene.