Liverpool fans threw bottles and fireworks at the bus of Manchester City as it arrived at Anfield.

Liverpool won the first leg of the Champions League tie 3-0.

Sources told ESPN FC that officials from UEFA were monitoring the arrival of the bus, so discipline from European football's governing body could follow.

Jurgen Klopp apologized for the fans' actions, saying before the game: "I really don't understand that. We tried everything to avoid a situation like that. When we came through it was very positive and we didn't know what had happened before -- City went ahead of us. For Liverpool I have to say sorry."