Thai authorities say a bomb blast in southern Narthiwat province has killed at least one person and injured about 20 others.
Police say the explosion occurred Thursday in the town of Sungai Kolok.
It was not immediately clear who was responsible. But a Muslim separatist group called the Pattani United Liberation Organization had warned of a violent backlash over the deaths of some 84 people during protests Monday in southern Thailand.
Thai Prime Minister Thaksin Shinawatra has promised an investigation into the incident that brought widespread international outrage, particularly in majority Muslim countries.
Most of the deaths were attributed to suffocation after police packed detained protesters in a truck for transport to a detention center.
Information for this report is provided by AP, AFP and Reuters.