Suspected separatists have killed at least 15 people and injured four in southern Thailand, in one of the country's worst attacks in years.
Police officers were among those killed at the attack on a security checkpoint in Yala province.
The attackers used explosives and then scattered nails on roads in an attempt to slow down people chasing after them.
Thousands have been killed in southern Thailand since a separatist insurgency gripped the region in 2004.
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