United set to investigate fan frivolity

Before the start of the vital clash between Manchester United and Liverpool, 11 home fans entered the field of play before re-enacting Jerzy Dudek's costly blunder which gave United the points at Anfield earlier this season.

While most will rightly view the incident - which was orchestrated by famed Old Trafford prankster Karl Powell - with good humour, Manchester United will be concerned about the standard of security at the stadium.