BEIJING, August 19 (Xinhuanet) -- Thai authorities say they are hunting a "suspect" after Mondays bomb attack in Bangkok. And investigations continue into the blast that killed at least 22 people.

Police released photos from security camera footage showing a man at the blast site. But Thailand’s Foreign Ministry says it's too early to determine who was behind the attack or the possible motives.

Prime Minister Prayuth Chan-ocha said the bombing was the worst-ever attack on Thailand. He vowed to bring those responsible to justice and ensure the safety of foreigners living in Thailand.

"In our country there are individuals or groups of individuals who are seeking to destroy the country. The ongoing attempts at destruction might be politically motivated, targeting the economy, tourism, for whatever reason. The government will work to find those perpetrators and bring justice upon any networks involved as soon as possible," he said.

"The government guarantees through the best efforts, the safety of lives and assets, and the well being of foreigners living in Thailand, including those at embassies, counsellors, and other international organisations," he said.

(Source: CNTV.cn)