Col Pramote Prom-in, the spokesman of the Internal Security Operations Command Area 4, said Tuesday that the attack happened at 8:15 pm in Moo 7 village in Tambon Palu Kasamoh in Ba Cho district.
Pramote said the family was attacked with assault rifles.
Muya-ed Maman, 11, Bahari Maman, 9 and Issayas Maman, 6, were killed. Their parents, Jehmu Maman and Padila Maman, were severely injured.
Pramote said the Fourth Army Area commander was sorry for the loss and would cooperate with the government agencies concerned to provide compensation for the family.