A fight broke out between more than 20 males on a tram on Saturday.
The incident happened at the King Henry's Drive stop in New Addington at about 8pm.
British Transport Police (BTP) were called to the incident and found a fight between more than 20 youths.
The tram had been damaged and on man was treated for superficial injuries.
A BTP spokesman said it was unclear what the motive was and that there had been no serious injuries.
He said the BTP were using CCTV footage and forensic evidence were being looked at as they investigate.
Anyone with information is asked to call 020 7391 5275.
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