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On Thursday there were twin blasts in Hua Hin and Trang, and further explosions today in Hua Hin and Surat Thani.
The FCO said it was also “urgently clarifying reports of an incident in Phuket”, with the beach town of Patong believed to have been hit by several blasts today.
Blasts have additionally been reported in the beach province of Phang Nga in southern Thailand.
At least four have been confirmed dead by the explosions, with many more injured.
The Tourism Authority of Thailand (TAT) said two of the people injured in Hua Hin are British, but there is no suggestion their conditions are life-threatening.
TAT head of marketing UK and Ireland, Chris Lee, said he had no more detail on the Britons’ identities or conditions at present.
TAT said prime minister Prayut Chan-o-cha has instructed local authorities to step up security at key locations throughout Thailand as a preventive measure and to ensure safety and security for tourists and residents.
TAT domestic offices have been assigned to look after the welfare of injured tourists and to facilitate support services for all foreign and Thai visitors in their area.
The offices will provide assistance and coordinate with local authorities as needed.
While it is not yet known who is behind the blasts, or if the attacks are linked, an investigation is in process.
Planned events and tourism activities continue in Thailand as the nation celebrates the birthday of Queen Sirikit and Mother’s Day today.
TAT said all airports, as well as modes of transport nationwide, continue to be operating normally, but tourists and travellers are advised to prepare adequate travelling time to avoid getting caught in traffic due to large movements of people during this long-weekend holiday period.
"TAT is monitoring and assessing the tourism situation and will be providing further details as the situation develops," the tourist board said.
"In the meantime, we would like to encourage travellers to obtain information from various sources to get a balanced understanding about the reality on the ground in Thailand, so that they can plan their trips accordingly."
No one has yet claimed responsibility for the attacks, but suspicion is likely to fall on separatist insurgents, the BBC said.
The attacks seems to have particularly focused on tourist areas, with the Hua Hin explosions on Thursday night striking a bar area popular
with tourists, and foreigners were among those injured.
Police have reportedly ruled out international terrorism and said they had detained some suspects.
Constant updates on Thailand’s tourism can be found at tatnews.org and the TAT call centre can be phoned on 1672.