Manchester City coach Manel Estiarte has posted footage of the attack on the team bus on its way to Anfield on Wednesday night.
The sound of objects striking the vehicle can be heard in the video posted on Instagram by Estiarte, filmed from inside the bus as it drives slowly towards the stadium for the Champions League quarter-final match against Liverpool
His post is accompanied by the comments: "No words. Unacceptable."
Merseyside Police are conducting enquiries to identify those responsible for throwing objects at the bus, while Liverpool have condemned the attack and vowed to support City in establishing the facts of what occurred.