Police are warning clubbers in Vauxhall to be alert after one man died and two others fell ill this weekend at clubs on the Albert Embankment.
On Sunday morning at the Area club on Albert Embankment a man believed to be in his mid twenties became unwell and later collapsed.
He was talked to St Thomas' Hospital where he was pronounced dead at 5am
Shortly afterwards another man at the same club and a third man at neighbouring club Barcode began to show similar symptoms and were rushed to St Thomas' Hospital where they are stable but remain under close observation.
Two of the three patients – the dead man and the other man from the Area Club – were found in possession of a white powder of unknown content, which is suspected to have caused or contributed to their illness.
The exact cause of the fatality will not be known until toxicology examination is completed in the coming days.
Police officers are any recreational drug users to be extremely careful if they are considering using drugs of any sort, in particular at venues in the Vauxhall area.
Lambeth officers are appealing for anyone who can help with their enquiries to come forward as soon as possible.
"A quick response could help us prevent contaminated drugs circulating further and may save someone's life," said a Metropolitan Police spokesman.
Anyone with information is asked to call Detective Sergeant Janet Barracks on 020 8721 3597 or Acting Detective Sergeant Will Lexton-Jones on 020 8217 3662. After 10pm contact Detective Sergwant Gordon Barclay on 07785 774477. If you wish to remain anonymous call Crimestoppers on 0800 555 111.