Lt. Gen. Trairong Piwpan, chief of the Thai police force's forensic division, talks to reporters during a press conference at Lumpini police station in Bangkok, Thailand, Wednesday, July 17, 2024. The chief of the Thai police forensic division said Wednesday that police have found traces of cyanide in the cups of six people found dead in a central Bangkok luxury hotel. (AP Photo/Sakchai Lalit)

Lt. Gen. Trairong Piwpan, center, chief of the Thai police force's forensic division, talks to reporters during a press conference at Lumpini police station in Bangkok, Thailand, Wednesday, July 17, 2024. The chief of the Thai police forensic division said Wednesday that police have found traces of cyanide in the cups of six people found dead in a central Bangkok luxury hotel. (AP Photo/Sakchai Lalit)

Thai police display pictures of evidence during a press conference at Lumpini police station in Bangkok, Thailand, Wednesday, July 17, 2024. The chief of the Thai police forensic division said Wednesday that police have found traces of cyanide in the cups of six people found dead in a central Bangkok luxury hotel. (AP Photo/Sakchai Lalit)

Thailand's Prime Minister Srettha Thavisin, left, walks past Royal Thai Police Chief Torsak Sukvimol during a press conference at the Grand Hyatt Erawan Hotel in Bangkok, Thailand, Tuesday, July 16, 2024. Police said a number of people were found dead Tuesday in the luxury hotel in downtown Bangkok and poisoning is suspected. (AP Photo/Sakchai Lalit)

Thai Prime Minister Srettha Thavisin gestures as he is mobbed by the media upon arrival at Grand Hyatt Erawan in Bangkok, Thailand, Tuesday, July 16, 2024. Police said a number of people were found dead Tuesday in the luxury hotel in downtown Bangkok and poisoning is suspected. (AP Photo/Napat Kongsawad)

An ambulance sits outside the Grand Hyatt Erawan Hotel to Chulalongkorn hospital in Bangkok, Thailand, Tuesday, July 16, 2024. Police say the bodies of six people were found in the luxury hotel in downtown Bangkok. (AP Photo/Chatkla Samnaingjam)

A man walks outside the Grand Hyatt Erawan Hotel in Bangkok, Thailand, Tuesday, July 16, 2024. Police said a number of people were found dead Tuesday in the luxury hotel in downtown Bangkok and poisoning is suspected. (AP Photo/Chatkla Samnaingjam)

Thai Prime Minister Srettha Thavisin arrives at Grand Hyatt Erawan Hotel in Bangkok, Thailand, Tuesday, July 16, 2024. Police said a number of people were found dead Tuesday in the luxury hotel in downtown Bangkok and poisoning is suspected. (AP Photo/Napat Kongsawad)

Kornkiat Vongpaisarnsin, head of the forensic medicine department at Chulalongkorn University’s medical school, talks to reporters at Chulalongkorn Hospital during a news conference in Bangkok, Thailand, Wednesday, July 17, 2024. Initial autopsy results showed traces of cyanide in the blood of six Vietnamese and American guests at a central Bangkok luxury hotel and one of them is believed to have poisoned the others over a bad investment, Thai authorities said Wednesday. He said there was cyanide found in the blood of all six bodies, and a CAT scan showed no signs of blunt force trauma, reinforcing the hypothesis that they had been poisoned. (AP Photo/Sakchai Lalit)

Police officers talk to a staff member at the Grand Hyatt Erawan Hotel in Bangkok, Thailand, Tuesday, July 16, 2024. Police said a number of people were found dead Tuesday in the luxury hotel in downtown Bangkok and poisoning is suspected. (AP Photo/Chatkla Samnaingjam)

Police gather outside the Grand Hyatt Erawan Hotel in Bangkok, Thailand, Tuesday, July 16, 2024. Police said a number of people were found dead Tuesday in the luxury hotel in downtown Bangkok and poisoning is suspected. (AP Photo/Chatkla Samnaingjam)

Thai Prime Minister Srettha Thavisin speaks to the media during a press conference at Grand Hyatt Erawan Hotel in Bangkok, Thailand, Tuesday, July 16, 2024. Police said a number of people were found dead Tuesday in the luxury hotel in downtown Bangkok and poisoning is suspected. (AP Photo/Sakchai Lalit)