The deaths of six foreigners at a luxury Bangkok hotel are suspected to have been caused by cyanide poisoning, Thai police said on Wednesday, as the US Federal Bureau of Investigation joined local authorities in probing the mysterious killings.
Preliminary forensic evidence pointed to traces of cyanide in the blood samples of one of the victims and in a thermo flask and cups found in the hotel room, Trairong Phiwpan, commander of the Office of Police Forensic Science, told a press briefing on Wednesday.
