Scotland Yard is facing questions over why officers failed to stop the illegal rave which left an aspiring athlete dead and another teenager seriously ill.
Both teenagers were rushed to hospital after falling ill at the party which was attended by more than 2,000 youngsters at the abandoned post office in Croydon on Sunday.
But 15-year-old Rio Andrew died the following day. He had attended the rave with a group of friends
Local papers have reported the teenager fell ill after drinking beer laced with ketamine. Another 19-year-old, who was also taken to hospital, is thought to have had the same drink.
But police say a cause of death has not yet been identified and it is still waiting for the results of a post mortem.
DCI Steve Baxter, leading the investigation, said: "I want to speak to anyone who saw Rio during Saturday night, as he traveled from his home in Notting Hill to Croydon, to help us build up a picture of his night out.
“If someone did sell or give Rio drugs then I want information to help us catch whoever that was.”
A Met police spokesperson also admitted it had known of the event but failed to take action.
Officers became aware of the rave at 9.40pm on Saturday during a routine patrol. Support was called but when the riot van arrived to shut down the party, it was attacked with ‘missiles’ including furniture and fire extinguishers.
A police car windscreen was also smashed during the violence.
A decision was taken to surround the building and prevent any more people from entering, allowing the party to continue until 8.30am on Sunday.
Fourteen people have been arrested for offences including violent disorder, drug possession and money laundering.
An emergency meeting about the situation has been held between police and council officials.
A Met spokesman said it received a ’single piece of intelligence’ that the event was taken place which was reviewed by a local officer but no further action was taken.
He added: “We are now conducting an internal review into how this intelligence was handled.”
Rio was accomplished athlete in all disciplines especially in the shot put.
He was selected by the Jamaican national team during the 2012 Olympics to be part of their guard of honour during The Games.