An 18-year-old man has been arrested on suspicion of violent disorder following the rave in East Croydon.
He handed himself in to police after they released images of seven people wanted in connection to the illegal party in the former Royal Mail sorting office on Saturday night.
He remains in custody at a station in south London.
Police were pelted with fire extinguishers and masonry as they stopped people from entering the building in the early hours of Sunday.
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