Local authorities and forensic science investigators inspected the scene where the fire took place.
The transmission post belonged to the government-owned telephone service, TOT Plc, and was situated near Yala Islamic University. Some cables were damaged before the local fire brigade arrived.
According to investigators, the incident occurred yesterday evening. Arsonists used tyres and cloth dipped in oil to fuel the fire.
The authorities believed the incident was intended to create an insurgent incident in the South.