Liverpool fans threw bottles, cans, faerie and other items on the club bus of Manchester City, which drove up to Anfield.
"We unconditionally apologize to Pep Guardiola, his players, staff and officials who were in this incident. The behavior of a number of people was completely unacceptable, and the club will cooperate fully with the authorities to identify the perpetrators, "says Liverpool's statement.
Fortunately, none of the City players were injured, but the bus for returning to Manchester is unsuitable - the front glass and the driver's door are broken - so the "townspeople" had to call a new transport for returning home.