The second bomb explosion occurred about 8.40am when rangers of Company 4510 were on foot patrol at Ban Bango Gubo intersection in Moo 6 of Rangae district.
Ranger Adam Sosoh died on the spot and Rangers Veerayuth Khlakongming and Suhaning Johmaeng were injured.
Earlier this morning, about 7.08am, a ranger providing security for teachers was slightly injured by a bomb explosion on a road in Sisakhon district.
Rangers of Company 4915 were on foot patrol along a local road in Ban Khlong Luang of tambon Mayoong when the home-made bomb was detonated.
Ranger Sofian Arree-jehsor was slightly wounded by the bomb explosion and taken to Sisakhon hospital.