Manchester United have condemned fans who chanted "completely unacceptable" songs about the Hillsborough tragedy during Tuesday's defeat by Liverpool.
The club have said they will work to educate fans on the issue.
Ralf Rangnick's side suffered a heavy 4-0 loss at Anfield.
"Manchester United stands in solidarity with Liverpool and its fans in remembering the victims of the Hillsborough disaster," a club spokesperson said.
"Offensive chants about the tragedy are completely unacceptable and we will work with our supporters' groups to educate fans on the issue."
During the game, both sets of supporters had united in a fan-led minute of applause in support of Cristiano Ronaldo and his family following the death of his baby boy.