An 18-year-old university fresher is fighting for her life after falling ill at her halls of residence following a night out in Cardiff.
The teenager, who is studying at Cardiff University, was found collapsed by flatmates in her student digs at Talybont Halls in the early hours of Saturday morning.
Officers are interviewing fellow students to trace her movements on Friday night and they are investigating whether her collapse is linked to that of a 25-year-old man who died on Sunday.
A spokeswoman for South Wales Police said officers were called to Tongwynlais, Cardiff, at around 12.15am on Sunday after the man fell ill.
She said the man’s friends and medics attempted CPR but he died in hospital.
The spokeswoman said: “There is nothing at this stage to suggest they are connected but detectives are keeping an open mind and investigating the possibility that the drug Ketamine might be a factor.”
Detective Chief Inspector Tom Moore, added: “Two families have been left devastated by these tragic events over the weekend and they are being supported by officers as we continue with our enquiries.
“One man has died and a female student residing at Llys Talybont Halls of Residence is critically ill in hospital.
“SWP detectives are working hard to establish the exact circumstances and would appeal for anyone with information to please contact us.”
Eight people have since been arrested on suspicion of being concerned in the supply of drugs and one, Richard Rees, 31, has been charged in the supply of cocaine, possession with intent to supply cocaine, and possession of cannabis.