What happened at Phuket cafe where Indian tourists fainted one by one 'for no obvious reason'? 1 dead

A 26-year-old Indian tourist, Kushagra Agarwal, died at a Phuket cafe after collapsing on May 9th. The Indian embassy is providing support to his family and is working with Thai authorities investigating the incident. Three other members of the group also fainted at the same cafe, one in a coma and two requiring further treatment. Police are looking into possible illicit substances or alcohol as a contributing factor but have not released any findings.