UEFA has opened disciplinary proceedings against Manchester United and Liverpool following disturbances during Thursday's highly-charged Europa League tie.
The rivals' first-ever European meeting ended with Jurgen Klopp's men progressing from the last-16 with a 3-1 aggregate win, completed with a 1-1 draw at Old Trafford.
Thursday's match was not without incident, though, and within 12 hours of the final whistle UEFA has announced numerous charges against both clubs.
Liverpool have been hit with five charges, with all but the late kick-off offence relating to their supporters.
The setting off of fireworks in the away has landed a UEFA charge, so too the throwing of objects and more general crowd disturbances.
Liverpool have also been charged with illicit chanting - something United have somehow avoided in both legs, despite vile chants about the Hillsborough disaster clearly being audible.
The Old Trafford club have been charged, like the visitors, with crowd disturbances and throwing objects, in addition to blocked stairways under the European governing body's safety and security regulations.
The case will be dealt with by the UEFA Control, Ethics and Disciplinary Body on May 19.
Greater Manchester Police arrested five supporters around Thursday's last-16 tie.
Two people were arrested for affray and another for criminal damage, having smashed a minibus window.
The trio were detained overnight as was another individual arrested for being drunk and disorderly, while an individual charged with setting off a flare received a caution.