Investigators say no group has claimed that it carried out the attack A bomb explosion in the centre of the Thai capital, Bangkok, has seriously wounded a security guard.
The blast, at a duty-free store, was just metres from the site of a recent grenade attack.
It is the third such incident within the past month, despite heightened security.
Bangkok has been under emergency rule since anti-government protests were broken up by troops three months ago.
The target of the attack was the Kingpower duty-free store company – a large and lucrative business which secured a monopoly at Bangkok’s Suvarnabhumi airport.
Analysts say the company’s leadership is associated with a key partner in the current governing coalition.
A grenade exploded and seriously injured one man on 30 July in Bangkok, five days after a fatal blast at a bus stop in central Bangkok.
The explosions are occurring during a continued state of emergency in the capital, imposed since violent anti-government protests in April and May.
So far, no group has said it carried out any of the attacks.
Around 90 people died and 1,800 were injured during the confrontation between the anti-government “red shirts” and the security forces.
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.