A Merseyside police officer in a patrol car was left powerless when scrambler riders surrounded him, shouting abuse and kicking his car.
Footage of the incident, in Huyton, Liverpool, was captured on Monday November 7 after trouble flared between the police and members of a biker escort at 13-year-old Frankie Murphy's funeral.
Murphy was killed in a traffic accident while riding his bicycle last month, and despite calls from his dad, Garry, for the group not to cause trouble, as soon as the service began, the bikers began misbehaving.
Commenting on the incident Assistant Chief Constable Ian Critchley said: "We recognise that this is an extremely difficult time for the family of Frankie Murphy. As a result detailed plans were put in place to ensure the smooth running of the funeral cortege.
"Sadly, during and following the service a number of riders were seen driving in a reckless, dangerous and criminal manner in areas of Liverpool, Sefton and Knowsley.
"Some of the riders were seen driving through red lights and on the wrong side of carriageways.
Referring to the incident caught on camera, he added: "At around 1.50pm, damage was also caused to the wing mirror of a police vehicle at the junction of Liverpool Road and Twigg Lane."