Officers investigating the disorder at the Saturday's Millwall vs Wigan FA Cup semi-final at Wembley have arrested a 27 year old man.
The man was arrested earlier this morning at his home address in Lewisham on suspicion of theft of a police hat.
He was taken to a south London police station and has since been bailed to return on a date in June pending further enquiries.
Officers from Operation Arrowtip are looking to identify all those engaging in disorder and would encourage anyone with information to contact the investigation team on 020 8246 0076 (not 24 hours) or Crimestoppers on 0800 555 111. All calls will be treated in the strictest confidence."