Hospitals in Thailand have been asked to tighten security measures to prevent a gang of thieves from stealing patients' belongings.
The gang is believed to have offered patients and their relatives "doctored" water, after which they become unconscious, Bangkok's The Nation reported.
The warning comes after the Medical Services Department (MSD) received a report from Bangkok's Ramathibodi Hospital that members of a gang had conned patients and their relatives in the outpatients' ward into drinking water that they were offering "as a gesture of hospitality".
The water was allegedly mixed with a sedative and muscle relaxant Xylazine. The MSD said that the use of Xylazine - normally used for sedating and anaesthetising animals - could be dangerous to humans.
Police said that since the beginning of the month, they have received three reports of people being robbed at three hospitals.
Investigator Lieutenant Colonel Banyong Dammankong said they arrested a 30-year-old man for theft after viewing CCTV footage.
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