Supporters that sang offensive chants toward Liverpool fans do not reflect the values of Manchester United, the Old Trafford club said.
Manchester United has condemned supporters that sang offensive chants in Thursday's Europa League defeat at Liverpool.
Songs referencing the stadium disasters at Hillsborough and Heysel in the 1980s could be heard during the last-16 first leg at Anfield, in which United lost 2-0.
Those responsible have been met with widespread criticism and United has vowed to prevent a recurrence by holding talks with supporter groups.
"It has always been the position of Manchester United that chants of this nature, which refer to historical tragedies, have no place in the game and do not reflect the values the club holds," a United spokesperson said.