The ongoing hostility between Luis Suarez and Patrice Evra, following the pair's race row in October, overshadowed Saturday's clash between Manchester United and Liverpool, requiring apologies on Sunday from Suarez and his manager Kenny Dalglish.
Here, we look back over how the latest instalment of the controversy unfolded.
Saturday, February 11
11:50am: Liverpool's teamsheet confirmed Suarez would start the game at Old Trafford.
12:45pm: Suarez and Evra did not shake hands before the match. United defender Rio Ferdinand subsequently refused to shake Suarez's hand.
1:30: The two sets of players reportedly clashed in the tunnel at half-time.
2:30: The final whistle was greeted by further clashes on the pitch, seemingly sparked by Evra celebrating in front of Suarez.
3:00: Manchester United manager Sir Alex Ferguson said Suarez was "a disgrace to Liverpool football club" while Dalglish said Sky Sports interviewer Geoff Shreeves was "bang out of order to blame Luis Suarez".
Sunday, February 12
2:15pm: Suarez apologised for his "mistake" in not shaking Evra's hand.
2:30: Liverpool managing director Ian Ayre said the club was misled by Suarez and criticised the Uruguayan for failing to shake the hand of Evra.
3:30: Liverpool manager Kenny Dalglish apologised for his conduct during the post-match interview with Shreeves.
4:08: Manchester United publish a statement on their website, accepting the Liverpool apologies.