Several bomb blasts have rocked southern Thailand, hours after two bombs killed one and injured 23 in the southern resort town of Hua Hin.

Late on Thursday, twin blasts killed a food vendor in the tourist town of Hua Hin, about three hours’ drive south of Bangkok.

In the early hours of Friday, Hua Hin was struck again by at least one more blast.

Another bomb went off in the popular beach resort of Patong, on the island of Phuket.

BBC reports that at least three people have been killed, and dozens injured across Thailand in Friday’s blasts, while other news outlets are reporting that four people are dead and 43 injured, many seriously.

The Daily Mail reports that as well as the explosions in Hua Hin and Patong, there were also explosions in the town of Surat Thani, and one in Trang on Thursday.

While no one has claimed responsibility for the bombings, it is thought they are probably the work of separatist insurgents who have been waging an armed campaign against the Thai military in the south for some time.

The blasts coincide with the 84th birthday of the nation’s Queen Sirkit.

In the first reported blast in Hua Hin, a Thai woman selling papaya salad at a street cart was killed in the second of the three blasts.

Local police said 11 of the injured were foreigners, a mixture of Dutch, German, Austrian, British and Italian tourists, according to the ABC’s local correspondent.

No Australians are believed to be have been hurt.

Wildlife Friends Foundation founder Edwin Weik told the ABC he was at the scene around 10 minutes after first blasts.

“There was a lot of blood, towels, tissues, I mean all kinds of stuff that people use to stop the bleeding of the wounded people,” he said from Hua Hin.

“I saw that on two different sides, about 100m away from each other … where tourists are going to have drinks and walk around, two bombs went off that were planted in pot plants.

“One [was] at an intersection, another one in front of a bar, next to a temple.”

Huahin bomb site now pic.twitter.com/TkChwFC2l6

— Edwin Wiek (เอ็ดวิน วีก) (@EdwinWiek) August 11, 2016

He put the number of injured foreigners at five — two Dutch people, two Britons and one German woman.

Mr Weik said there were no serious injuries in the first blast, but the second bomb caused serious damage.

“At the second spot, around a dozen people got injured and according to the police — confirmed now — one person has died,” he said.

The final blast, which came hours after the twin attacks, was reported to be hidden in a flower bed exploding in front of the marine police offices, killing a municipal worker, Provincial governor Wongsiri Promchana said.

“I think it’s related to the blasts in Hua Hin,” Mr Promchana said, referring to the earlier attacks overnight.

In a statement, the Department of Foreign Affairs said Australia’s embassy in Bangkok was “in urgent contact with local authorities to determine if any Australians have been affected”.

DFAT said anyone concerned for loved ones in Thailand “should contact the Department of Foreign Affairs and Trade’s 24-hour Consular Emergency Centre on 1300 555 135 within Australia or +61 6261 3305 from overseas”.

More to come.