Political violence has taken place across the country for over a decade.
The 12-year conflict has led to the deaths of more than 6,000 people, but this latest attack, which targeted tourists, would represent a tactical
departure should it be found that separatist insurgents were indeed the perpetrators.
Bombs were remotely detonated in five different locations by mobile phones. Investigators found ball-bearings at one site, and think they were put in the bombs to cause maximum injury.
Among those injured two Britons were counted meanwhile the British embassy has warned holidaymakers in Thailand to be extremely cautious.
Hua Hin and Phuket which are popular with terrorist were targeted.
Southern separatist insurgents are
suspected though no single group has claimed responsible.