Police today made four further arrests after releasing CCTV pictures of a number of fans wanted in connection with trouble at last week's Manchester derby.
Trouble flared at the Carling Cup semi-final first leg between Manchester City and Manchester United at Eastlands last Tuesday. City won 2-1 and the second leg takes place tonight at Old Trafford.
Officers yesterday released CCTV footage of a number of men they believed were involved in disorder.
A Greater Manchester Police spokesman said four arrests were made yesterday in Manchester.
He added that a further four were made today - two in Oldham, one in Preston and one in Bradford.
Eighteen arrests were made last week after the match and appeals have been made for calm ahead of tonight's game.