Police were called out to Abington Street in Northampton town centre this afternoon to deal with a parking dispute that led to the road being blocked.
Shoppers were forced to move out of the way as a patrol car drove down the pedestrianised part of the street at about 1.30pm.
Witnesses reported seeing a man being arrested outside Cafe Nero by an off-duty police officer.
The cause of the dispute appeared to be alleged damage caused to a vehicle near All Saints Church.
Northamptonshire Police has been approached for a comment.