The Thai police said on Wednesday that they had found traces of cyanide on flasks and teacups in a Bangkok hotel room where six bodies were found the previous day, and that one of the people found dead was believed to have administered the poison.

       Maj. Gen. Noppasin Poonsawat, the deputy police chief in Bangkok, told reporters that one of the six people “did this by using cyanide.” He did not identify the person. General Noppasin said the group had gathered in Bangkok to discuss an investment plan in which several of them were involved.

       The bodies were found on Tuesday in a hotel room at the Grand Hyatt Erawan in the heart of downtown Bangkok, and little was immediately revealed about how they had died. The case has shocked Thailand, and officials have rushed to offer assurances that the country, one of the world’s most popular tourist destinations, remains safe.

       Subscribe to The Times to read as many articles as you like.