
The bomb went off in the morning when the restaurant was packed with customers, including policemen and militia.
The device was hidden in a pick-up truck and detonated near a number of parked police trucks as officers bought breakfast.
The insurgents used a walkie-talkie to detonate the bomb, which is a new method that is more popular in Afghanistan and Iraq. In the past, the insurgents used mobile phones to detonate bombs.
It was the latest of several car bombings in the south on restaurants during Ramandan Festival. On Thursday, a bomb planted in a motorcycle went off outside a restaurant in Pattani, killing one person and wounding 29.
On August 25, a bomb exploded outside another restaurant in Pattani, 670 kilometres south of Bangkok, injuring 26 civilians.