Unseen footage shows pitch invader's two-footed tackle on Andy Robertson that got him arrested

Footage filmed on the Anfield touchline has emerged showing the moment a 16-year-old fan collided with Andy Robertson during Liverpool's 7-0 win over Manchester United.

Shortly after Roberto Firmino netted Liverpool's seventh goal of the game on Sunday afternoon, the Brazilian forward was celebrating with his teammates when a fan slipped and crashed into the back of the huddle.

Moments later and full-back Andy Robertson went down holding his ankle – an incident that was met with roars from a furious Jurgen Klopp, who understood the potential damage it could have caused.

Thankfully Robertson carried on, while the fan was arrested by police on suspicion of encroaching onto a football pitch. You can see the fan footage from Sunday's bizarre incident involving Robertson below. This must have hurt...

Liverpool soon released a statement confirming an immediate investigation to identify and ban the individual pitch runner.

They said: "The offender ran onto the pitch and collided with Liverpool players, risking injury, as they celebrated the seventh goal in front of the Main Stand. There is no excuse for this unacceptable and dangerous behaviour.

"The safety and security of players, colleagues and supporters is paramount. The club will now follow its formal sanctions process and has suspended the alleged offender's account until the process is complete.

"If found guilty of the offence of entering the pitch without permission, the offender could face a criminal record and a lifetime ban from Anfield and all Premier League stadiums. These acts are dangerous, illegal and have severe consequences."

Merseyside Police also released a statement following the supporter's arrest.

It read: "A 16-year-old boy has been arrested following the Liverpool vs Manchester United game at Anfield yesterday (Sunday 5 March).

"During the match a supporter was seen on the pitch. Officers later arrested a 16-year-old boy from Winsford on suspicion of encroaching onto a football pitch.

"He is scheduled to voluntarily attend a police station in Merseyside regarding this incident. Our officers are currently working with Liverpool Football Club in relation to the incident."

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Goals from Cody Gakpo [2], Darwin Nunez [2], Mohamed Salah [2] and Roberto Firmino handed Manchester United their joint-heaviest defeat in its 145-year history at Anfield, while Liverpool climbed to fifth in the league table.