Thailand's Prime Minister Abhisit Vejjajiva on Tuesday said the state of emergency's enforcement in capital Bangkok will continue in a bid to ensure public safety, the Thai news Agency (TNA) reported.

The premier's remark was made after the bombing incident outside a superstore in central Bangkok on Sunday that killed one person and injured several others.

Concerned authorities have been ordered to extensively investigate the case in order to prevent the violence attack from renewing, Abhisit said.

Defence Minister General Prawit Wongsuwan has ordered a security beef-up at several spots in Bangkok after the blast a bus stop outside Big C superstore in Ratchadamri area, Internal Security Operations Command (ISOC) spokesman Major General Dittaporn Sasamit said earlier, the Matichon online reported.

Meanwhile, the government will gradually lift the state of emergency in 15 other provinces, Abhisit said.

The enforcement of the state of emergency has remained in capital Bangkok and 15 other provinces, or totaling 16 provinces though the over-two-month long rally by the "red-shirts" ended on May 19.

The emergency decree was originally imposed in 24 provinces of Thailand's 76 provinces, including Bangkok, on April 7, 2010, empowering police and army to control the then anti-government protests.

After the weekly cabinet meeting on July 6 decided to lift the emergency decree in five provinces, on July 20 the cabinet resolved to lift it in three more provinces.

The death toll from a series of violent clashes between the " red-shirt" protestors and troops during March 12 to May 19 in central Bangkok stood at 88 as some 1,885 others were wounded.