Liverpool chief calls for fans to behave ahead of Champions League clash with Barcelona

Videos have circulated on social media apparently showing individual supporters, in different incidents, pushing locals into a fountain at Placa Reial, just off La Rambla.

Later in the evening police cordoned off the square and forced all fans back on to the main tourist strip before walking them up the street to Placa de Catalunya, a main transport hub, where they dispersed.

Merseyside Police are understood to be aware of the existence of the video, as, apparently, is Moore.

“We proudly sing that we’ve conquered all of Europe. But let’s treat this beautiful city with the respect that it deserves, and act in a manner that is befitting of LFC,” the Reds chief executive wrote on Twitter.

“By all means have a good time, but we are Liverpool, and as such, let’s visit here with grace and humility.”

On Tuesday, as thousands of fans began to arrive in the city for the Champions League semi-final first leg, Merseyside Police’s dedicated Twitter account for LFC fans tweeted the advice: “Eat, drink and enjoy all areas in the city centre. Respect monuments.”

Liverpool, as a club, condemned the behaviour as “totally unacceptable”.

“Liverpool Football Club is working with Merseyside Police and the authorities in Spain, who are endeavouring to identify those involved in the incident,” said a statement.

“Such behaviour is clearly totally unacceptable and will not be tolerated.

“It would be inappropriate to comment further while the situation is ongoing other than to confirm the club will follow due process in any and all cases of this nature.”