Pol Lt Jira Sajja, duty officer at Cho Ai Rong, said the attack occurred about 8.30am at a bridge near Ban Pare Rubo in tambon Marubo Ok, where six men from the 48th Ranger Regiment were patrolling on three motorcycle along a road to provide security for teachers.
Two rangers - Boonpen Liga and Charoonsak Pitakkij - stopped their motorcycle and walked across to examine one end of the bridge. A bomb planted on the spot was detonated remotely.
The two rangers were wounded in the explosion, but not seriously. They were admitted to Narathiwat Ratchanakarin Hospital.