A man in his thirties has died after taking what is believed to be ecstasy. He collapsed at the Fridge nightclub in Brixton at 4.30am on Sunday.

When an ambulance arrived two men had collapsed, one of them was pronounced dead on arrival at hospital. The other man’s condition is described as serious but stable.

The deceased has been identified by family but a post mortem and formal ID has yet to take place.

Three hours later a man in his twenties collapsed at Fire nightclub in Vauxhall.

He was taken to hospital where he remains in a serious condition. It is believed he had also taken ecstasy.

Police officers have urged other clubgoers to seek immediate medical assistance if they feel unwell after taking drugs.

“The tablets we are concerned about are described as pink with small white dots on them,” a police spokesman told PinkNews.co.uk.

“Another is a white tablet with the letter G pictured on it with various numbers appearing on the reverse of the pill. One example is the number ’0030.’

“Anyone with information is asked to contact Lambeth police on 07824 474 003.

“Lambeth police also have a dedicated LGBT officer and they can be contacted on this number.”