A Manchester City fan reportedly cracked a window on Liverpool's team bus as it left the Etihad by throwing a brick at the coach.
Pep Guardiola's side eased to a 4-1 win at home against their Merseyside opponents to boost their Premier League title chances.
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City avenged their 1-0 defeat at Anfield earlier in the season, where their own bus was targeted by Liverpool fans.
And it appears that a minority of City supporters looked to take revenge, with The Athletic declaring Liverpool's coach was damaged.
They have stated that a window was cracked after a brick was thrown, though thankfully, no one on board is believed to have suffered any injuries.
Greater Manchester Police have subsequently launched an investigation into the shocking issue.
City condemned the alleged attack on Liverpool's team bus, while they also slammed supporters that sang 'inappropriate chants' aimed at Reds fans.
A statement on their website read: "Manchester City FC has been made aware that Liverpool FC’s coach sustained damage on its return journey following today’s game.
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"We understand an object was thrown towards the coach in a residential area.
"Incidents of this kind are totally unacceptable, and we strongly condemn the actions of the individual(s) responsible.
"We will fully support Greater Manchester Police’s investigation into this incident in any way we can.
"Additionally, the Club is disappointed to have heard inappropriate chants from home fans during the game today.
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"We regret any offence these chants may have caused and will continue to work with supporter groups and officials from both clubs to eradicate hateful chanting from this fixture."
Liverpool are yet to publicly comment on the incident.