For a fixture that has represented the highwater mark of British football in recent years, Liverpool's games with Manchester City are becoming increasingly toxic.
It's difficult to pinpoint the moment when the rivalry between the pair started to descend into what is now surely the most poisonous in the top flight; certainly between those established inside the top six, but it might reasonably be traced back to April 2018 ahead of a Champions League quarter-final tie at Anfield.
As the visitors' team bus rolled into the ground some hours before kick-off five years ago, the vehicle was pelted with cans and bottles by a mindless minority. It was an incident that was later played down by Pep Guardiola, Vincent Kompany and Kevin De Bruyne, who said: "Breaking windows is probably not done. But who am I to say something? I'm OK with it, as long as nobody's hurt I'm fine."
