Suspected Islamic militants shot dead three workers from Myanmar and beheaded one of them during an attack on a construction site in Thailand's Muslim-majority south, police said on Monday.
Four others were seriously injured in the attack by six suspected insurgents late Sunday in Pattani, one of three insurgency-plagued provinces along the Malaysian border.
Fifteen workers were living at the site, police said. The three victims were all in their 30s.
In neighbouring Yala province, nine people were injured, three of them critically, early Monday after a five-kilo (11-pound) bomb exploded at a morning market.
Some 2,000 people have been killed in Thailand's restive south in the past three years. There has been a recent upsurge in violence despite a raft of peace-building measures proposed by Thailand's military-backed government.