Thai Prime Minister Prayuth Chan-ocha speaks to reporters at the Government House in Bangkok Aug. 18, 2015. Prayuth Chan-ocha on Tuesday promised the authorities would quickly track down those responsible for the central Bangkok bombing, which he described as the country's worst attack ever. (Xinhua/Rachen Sageamsak)

BANGKOK, Aug. 18 -- Thai Prime Minister Prayut Chan-o- cha on Tuesday vowed to expedite all investigative efforts to find the perpetrators of a Bangkok explosion, which has left 20 dead and more than 100 injured, and bring them to justice. "From this incident, it is apparent that there are active individuals or groups that harbor the intention to damage Thailand, who may be pursuing political gain or other intentions by damaging the economy and tourism,"Prayut said.

Five Chinese have been confirmed killed and more than 30 others injured in the blast that rocked Erawan Shrine at Ratchaprasong intersection, a popular tourist destination in downtown Bangkok, on Monday night. "We shall, to the best of our capabilities, employ all available measures to render support and assistance to Thais and foreigners who have been afflicted by this tragedy,"the premier said.

For foreign nationals residing in Thailand, including embassies, consulates and international organizations, he pledged to safeguard their security of life, property, and interests.

Prayut also asked for cooperation from the media, including all social media agents "in providing news that will be constructive rather than news which expounds violence and destruction, which may have a misleading effect on ongoing investigations and create misunderstandings in our society."