From Dan Rivers and Narunart Prapanya
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HAT YAI, Thailand (CNN) -- Six bombs exploded, one every five minutes, in a southern Thailand city, killing at least four people and wounding 30 on Saturday, police said.
The evening attacks in Hat Yai came just hours after a government-sponsored peace rally in the nearby town of Yala and on the 21st anniversary of the founding of the GMIP -- Gerakan Mujahideen Islami Pattani -- separatist movement.
The six bombs were placed about every 500 yards along the main commercial street, police said.
The targets included an Odeon department store, a marketplace and the Lee Garden Hotel, police said.
The explosives were hidden in motorbikes and a tuk tuk -- a tricycle taxi -- and were apparently triggered remotely by cell phones, police said.
Chaos followed in the streets of Hat Yai, which is normally free of the separatist violence that has plagued some of Thailand's southern provinces.