Investigators are digging deeper into a poisoning murder mystery in Thailand. Police have found traces of cyanide in the cups of two Vietnamese Americans and four Vietnamese nationals at a central Bangkok luxury hotel. Authorities believe one of them poisoned the others over a bad investment. The group was last seen alive when food was delivered to the room on Monday afternoon. 

Police say the case appears to be personal and won't impact the safety of tourists. 

(Photo by Lauren DeCicca/Getty Images)

Investigators are digging deeper into a poisoning murder mystery in Thailand. Police have found traces of cyanide in the cups of two Vietnamese Americans and four Vietnamese nationals at a central Bangkok luxury hotel. Authorities believe one of them poisoned the others over a bad investment. The group was last seen alive when food was delivered to the room on Monday afternoon. 
Police say the case appears to be personal and won't impact the safety of tourists. 
(Photo by Lauren DeCicca/Getty Images)

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