A building of Bang Maruat School in Panare district of Pattani province was burned down early Thursday morning, also causing the loss of 20 computers, 80 brand new tablet computers and other teaching equipment.
The building accommodated eight classes, a computer room and an administration office.
A team of forensic police led by Pol Col Manit Yimsai, the Panare police chief, went to the school this morning for examination.
Muhamad Jeloh, the school director, said the fire broke out about 1am while he and other teachers were staying in another building.
Mr Muhamad said the fire spread quickly and burnt down the building.
Also gone were 80 brand new tablet computers which arrived at the school only about a month ago and had not been used.
The fire broke out after the school was closed by the Confederation of Teachers of Southern Border Provinces after the director of Tha Kam Sam School in Nong Chik district was shot dead on Nov 22.
Police were investigating the cause of the fire.