400 extra officers drafted in by the British Transport Police Saturday . Rivals Manchester United , Liverpool and Leeds will all be in London . United face Chelsea and Leeds travel to Charlton Athletic on this weekend . Liverpool face Aston Villa in the FA Cup semi-final at Wembley Stadium .
400 extra officers drafted in by the British Transport Police this weekend . Rivals Manchester United , Liverpool and Leeds will all be in London . United face Chelsea and Leeds travel to Charlton Athletic on Saturday . Liverpool face Aston Villa in the FA Cup semi-final at Wembley Stadium .