The Government has raised the outbound travel alert for Bangkok to red following a bomb explosion close to the town centre last night.
The alert for other parts of Thailand remains at amber.
Hong Kong people should avoid non-essential travel to Bangkok, while those already there should pay attention to announcements by local authorities, attend to their personal safety and avoid areas affected by the blast.
The Security Bureau is monitoring the situation and will issue updates through the media and its website.
Those who need assistance can call the Immigration Department on (852) 1868 or the Chinese Embassy in Thailand on (66) 854833327.
