Thai military personnel conduct a security patrol near Erawan Shrine, Bangkok, Thailand, 14 August 2016. [Photo/IC]

The resort was the scene of the most devastating of the wave of bombs when a blast ripped through an alley in a bar area on Thursday evening. There were two more blasts in the town less than 12 hours later.

Another fire bomb was found on the island of Phuket on Sunday and defused, local police said. It had been set to detonate at 3 am on Friday (2000 GMT on Thursday), local police said.

In Phang Nga, two devices were found on Saturday near a market that was torched in an attack early on Friday.

"One worked and the other two didn't," Phakaphong Tavipatana, the governor of Phang Nga, told Reuters, adding that police hoped to find fingerprints on the defused devices.

Phuket and Phang Nga were both hit in the attacks on Thursday and Friday, as was Surat Thani, a city that is the gateway to the popular islands in the Gulf of Thailand.

Attackers struck targets in seven southern Thai provinces, using bombs as well as incendiary devices that set shops and markets ablaze.

A man has been arrested and was being questioned in connection to an arson attack on a supermarket in the southern province of Nakhon Si Thammarat, Pongsapat said. Police believe more than one individual was involved in that attack, he said.

The movements of other suspects were being monitored, he added.