The six people who died in a luxury hotel suite in Thailand were poisoned by cyanide-laced drinks, police said.
The police suspect that one of the dead was in debt and was behind the poisoning.
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Letter to the Reader — Why We're Asking for Your Support ContributeSix tourists were found dead by staff at the Grand Hyatt Erawan hotel in the Thai capital Bangkok late Tuesday.
Investigators believe they were dead 24 hours before the bodies were found.
Two of the six dead had lent $280 to another for investment purposes.
When the bodies were found, there was confusion and mystery. Local media reported that there were shots fired, which the police denied.
Thailand's Prime Minister, Srettha Thavisin, during a visit to the hotel on Tuesday ordered an urgent investigation into the case, stressing that it was a "private matter" unrelated to national security.
Now the suspicions are that one of the dead poisoned the others with cyanide as well.
The four dead were Vietnamese nationals, while the other two were American nationals.
*Cyanide is a fast-acting, potentially lethal chemical that interferes with the body's ability to use oxygen. Cyanide can be a colorless gas or liquid, such as hydrogen cyanide (HCN) or cyanogen chloride (CNCl). Cyanide can also be in crystal (solid) form such as sodium cyanide (NaCN) or potassium cyanide (KCN).