Five policemen were killed and three others severely injured in Thai southern province of Narathiwat as two police vehicles were attacked by a roadside bomb on Thursday afternoon.
The team of policemen were traveling to pick up teachers of Ban Ruesoh School to escort them home in Ruesoh district of Narathiwat by two pick-up cars while the separatists detonated a roadside bomb at about 3:00 p.m. local time (0800 GMT), a military source told Xinhua.
At least five policemen were killed and three others injured in the blast. Police said they believe the bomb was detonated by mobile phone signal which was triggered by Thai southern separatists hidden nearby.
The blast caused a one-meter-deep and 1.5-meter-wide hole on the ground, police said.
An unknown number of attackers ran away before the military and police launched a manhunt.
At least 1,200 people have been killed since unrest broke out in January 2004 in the mainly Muslim provinces along Thailand's border with Malaysia. The violence was blamed on a complex web of Islamic separatists, local corruption and organized crime.