The wave of violence included shootings on the streets of three Muslim-dominated provinces and a grenade attack on a crowded outdoor market that injured more than two dozen people.
Police said the victims included both Muslims and Buddhists. One police officer was gunned down in Pattani province.
The incidents were linked to an on-going insurgency aimed at achieving greater autonomy for the provinces along the Malaysian border, the Bangkok Post said. The ongoing violence has caused more than 5,300 deaths since 2004.
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