A man has died and a woman is critically ill in hospital after taking "dangerous and harmful drugs".
It's believed the 25-year-old man 18-year-old woman had taken an "illegal drug" that may have contained "a cocktail of toxic ingredients".
Police have now issued a warning to users after the man lost his life and the woman remains in a critical condition in the Cardiff area.
South Wales Police have launched an investigation into the supply of a "dangerous and harmful" drug which is believed to be linked to Ketamine.
In a statement, a spokesperson for the force said: "Users of controlled drugs should be aware that they can never be 100% sure of exactly what they are taking.
"These drugs are illegal and there is every possibility that they may contain a cocktail of toxic ingredients.
"The Wales Drug and Alcohol helpline – 0800 6 33 55 88 – provides a free and bilingual single point of contact for anyone wanting further information or help relating to drugs or alcohol."
Police are urging anyone with information relating to the use or sale of drugs to call 101 or Crimestoppers anonymously on 0800555111.
