A police sergeant was killed and 43 others were wounded when a grenade was thrown into their lines as they assembled for the national anthem in front of the Muang police station in Pattani on Wednesday morning, police said.
One of two men riding a motorcycle threw the hand grenade over the station fence, according to witnesses. It landed next to the flagpole, then exploded.
Police said the explosion killed a sergeant, who died on the way to hospital. Three others were in critical condition.
About two hours after the attack, a bomb hidden inside a car parked about 20 metres from the police station exploded, injuring at least 10 people, police said.