Thailand has been struck by a series of coordinated explosions targeting tourist towns across the country.
As many as four people are believed to have died during the attacks, with many more injured.
The tourism hotspot of Hua Hin has been worst affected, with four explosions in the past 24 hours.
The explosions took place in a busy street area close to the popular resort.
No group has yet said it carried out the attacks, but suspicion will likely fall on separatist insurgents.
However, Thai police have yet to officially place blame.
There have also been blasts in Surat Thani, where one person has died, with two further explosions reported in Patong on the tourism island of Phuket.
A further blast was also reported in Trang.
The campaign comes just days before the one-year anniversary of the bomb blast at the Erawan shrine in Bangkok.
That attack killed 20 people.
Thais last week voted in a referendum which approved a new constitution that will strengthen military influence in politics following a coup in 2014.
The British Foreign & Commonwealth Office said in a statement: “You should exercise extreme caution, avoid public places, and follow the advice of local authorities.
“There is a high threat from terrorism.”
As many as one million Brits visit Thailand each year.