BANGKOK - Authorities in Thailand have arrested two suspects in connection with a bomb explosion at an annual festival in northern Tak province that killed three people and injured 48 others, police said on Saturday.

National Police Spokesman Archayont Kraithong said an initial investigation revealed that one of the suspects confessed to carrying the explosive device, adding that the motivation stemmed from both suspects' grievances against a local youth group.

In a social media post, Prime Minister Paetongtarn Shinawatra expressed her deepest condolences to the families of the deceased and the injured in the explosion that occurred shortly before midnight on Friday.

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Paetongtarn ordered the police and security agencies to swiftly investigate the incident, apprehend the perpetrators and bring them to justice, as well as instruct relevant authorities to enhance security measures at all upcoming festivals to ensure public safety.