Manchester United have condemned the behaviour of fans who sang offensive chants about the Hillsborough disaster at Liverpool on Tuesday as "completely unacceptable".
Video footage has emerged of a section of United fans taunting their rivals over the tragedy that claimed 97 lives in 1989 during their 4-0 defeat at Anfield.
United claim they will seek to educate fans, with a club spokesperson saying: "Manchester United stands in solidarity with Liverpool FC and its fans in remembering the victims of the Hillsborough Disaster.
"Offensive chants about the tragedy are completely unacceptable and we will work with our supporters' groups to educate fans on the issue."
The chants came after Liverpool fans had joined in with a minute's support for United forward Cristiano Ronaldo, who was absent from the game following the death of his newborn child, as they sang their anthem 'You'll Never Walk Alone'.
The scenes, and subsequent apology, come just days after Manchester City were forced to apologise after their fans sang during a minute's silence ahead of the FA Cup semi-final on Saturday.