Thai police on Friday reported 22 attacks, including at least five small bomb blasts, in Muslim-majority southern Thailand only hours after King Maha Vajiralongkorn signed a new constitution on Thursday as a step toward ending military rule.

There were no immediate reports of casualties in the attacks in the region where there has been a recent upsurge in a decades-old Muslim separatist insurgency. Parts of the region voted against the new constitution at a referendum last year.

"The incidents are to create disturbances. They want to destroy the government's credibility and create fear among people," said Pramote Prom-in, spokesman for local security forces.