Bangkok police chief Lt. Gen. Thiti Sangsawang identified the deceased as three men and three women. Two of them were Vietnamese Americans and four of them were Vietnamese nationals. Their ages ranged from 37 to 56.

Bangkok deputy police chief, Noppasin Punsawat, told reporters that the case appeared to be personal and there was no threat to the safety of tourists.

Police said that the agency obtained information from a relative that a husband and wife, who were among the dead, had invested about 10 million baht ($278,000) with two of the others, which was meant to build a hospital in Japan. The group might have been meeting to settle the matter, a potential motive the police are investigating. Authorities said one person killed the others but did not disclose who was the suspect.