Liverpool fans let off flares outside Anfield as they ramped up the atmosphere ahead of the Champions League quarter-final first-leg against Manchester City.
Hundreds of Reds fans lined the streets around the ground, singing songs and waving flags before the 7.45pm kick-off before Man City’s team bus was hit by missiles.
The statement on the club’s website read: “The club condemns in the strongest possible terms the scenes which preceded our Champions League quarter-final, which resulted in damage being inflicted on the Manchester City team bus during their arrival at Anfield.
“We apologise unreservedly to Pep Guardiola, his players, staff and officials caught up in the incident.
“The behaviour of a number of individuals was completely unacceptable and the club will cooperate fully with the authorities to identify those responsible.
“The priority now is to establish the facts and offer Manchester City whatever support is necessary.”
— Goal UK (@GoalUK) April 4, 2018
Liverpool claimed a stunning 4-3 Premier League victory on City’s last visit to Anfield in January.
Former Liverpool winger Raheem Sterling was left out of Manchester City’s starting line-up on his return to Anfield.
Pep Guardiola went for an extra central midfielder in Ilkay Gundogan, leaving Sterling on the bench, while Gabriel Jesus started up front in the absence of the injured Sergio Aguero.
Dejan Lovren partnered Virgil van Dijk in central defence for Liverpool following injuries to Joel Matip and Ragnar Klavan.
Reds boss Jurgen Klopp also opted for an all-English midfield in the form of Jordan Henderson, Alex Oxlade-Chamberlain and James Milner.
Liverpool fans threw bottles and fireworks at the Manchester City coach as it arrived at Anfield.
A number of red flares were also let off, making visibility difficult as supporters lined the streets outside the stadium.
Windows were damaged on the bus, but no injuries were sustained.
The atmosphere had been vibrant with a number of people climbing up lampposts, walls and road signs to catch a glimpse of the teams as they arrived.
City arrived first but their bus became a target for a few missiles as it slowed to navigate the corner of Arkles Lane and Anfield Road, where most of the fans were gathered.
Liverpool arrived to a raucous welcome moments later.