A wave of coordinated explosions rattled multiple cities in Thailand overnight and on Friday, killing several people and wounding dozens more, police said. Among the injured were 10 foreigners in the seaside resort town of Hua Hin.
It was not clear who was behind the attacks. But the timing and scope suggested they were carried out by opponents of the South-east Asian nation's ruling junta, which last weekend organised a successful referendum on a constitution that critics say will bolster the military's power for years to come.
The violence took place on the birthday of Thailand's Queen Sirikit. The junta has repeatedly said that defending the monarchy is a top priority, and the army and its allies are keen to ensure a smooth succession for ailing 88-year-old King Bhumibol Adulyadej, who is the world's longest reigning monarch.
The exact number of killed and injured by bombs not yet known.
Col. Sansern Kaewkamnerd, a junta spokesman, said Prayuth "expressed his sadness over the unexpected and tragic incident (in Hua Hin)" and said ordered police and soldiers in the area to step up security measures.
"It is too early to say who is behind this attack," Sansern said. "But I am confident that authorities will be able to find those who are responsible ... and bring them to the justice of the law."
However, Thai police say the wave of bomb blasts in central and south of the country are not linked to Islamic terrorism.