Police can confirm a second man has now died following an incident in Norwich linked to the use of illegal drug AMT.
The man, aged in his 20s, died at the Norfolk and Norwich University Hospital this morning after being taken ill at a property in Norfolk Street on Wednesday (7 January).
Officers launched an investigation after another man, also aged in his 20s, died on Wednesday.
Tests on substances seized have revealed traces of a drug known as AMT â€“ a former legal high which was reclassified as a Class A drug this week.
Four people, three men aged 22, 30 and 33, and a 20-year-old woman, were arrested on suspicion of supplying a controlled drug and questioned by detectives yesterday. All suspects have since been released on bail until 5 February.
Investigations continue and a file is being prepared for HM Coroner.