THE former Royal Mail delivery office in East Croydon has been boarded up following an illegal rave.
The building, in Cherry Orchard Road, was smashed up when thousands of people attended the event on Saturday night.
Windows were broken and revellers threw fire extinguishers, furniture and masonry at police when officers tried to shut the event down.
They eventually allowed the rave to continue before clearing the building on Sunday morning.
The delivery office, which closed earlier this year, has now been boarded up. Police were still at the scene on Monday morning.
Council leader Tony Newman and Croydon Central MP Gavin Barwell condemned the event, with the latter saying those responsible for the damage "should feel the full force of the law".
Nine people were arrested for various offences, including violent disorder and money laundering.
Police are treating the area as a crime scene and expect to make more arrests.
Seven people were taken to hospital, one with a head injury and others who were taken ill.
Tram and bus services were disrupted while the site was secured.
Mr Barwell said: "It is clearly unacceptable to have a situation where people are allowed to occupy a building, disrupt the whole public transport system and keep a lot of the people that live in the area up all night," the Conservative MP said.
"I'm all for people having a good time but it has to be in a safe environment."
The council said it is in discussions with Royal Mail over the security of the site.
