Manchester United supporters were heard directing tragedy chants towards Liverpool fans during their FA Cup clash.
The two arch-rivals faced off at Old Trafford in the quarter-final of the competition, with both desperate to secure a place at Wembley for the semi-finals.
However, the game was marred by songs from United fans which could be heard over the TV broadcast.
The tragedy chants were alleged to include calling Liverpool fans 'always the victims it's never your fault' - a song that refers back to the Hillsborough Disaster - while they were also said to be chanting 'The Sun was right, murderers' in relation to the same tragedy.