A police officer has been assaulted during wild scenes ahead of Saturday night's A-League grand final clash between Melbourne City and Melbourne Victory. There were chaotic scenes during pre-game celebrations as thousands of fans converged on Swan Street in Richmond. An officer was assaulted and taken to hospital with minor injuries. Police are still searching for the offender. "In what should have been an exciting and vibrant night for our Melbourne soccer community, we saw a number of flares being thrown towards police members and amongst the crowd as supporters gathered in Swan Street before making their way to AAMI Park," a Victoria Police spokesperson said. A security guard was also assaulted during the game. One man was arrested, interviewed and released. He will be charged on summons. Over the course of the night, there were 11 evictions from the stadium, four penalty notices for possessing a lit firework and one for riotous behaviour. Two people were cautioned for trespass. Victoria Police said it was disappointed with the behaviour of some of the crowd. "We will continue to work with the A-League, clubs, stadium management and security providers following the grand final to review and address concerning behaviours," the spokesperson said. Melbourne City beat its fierce cross-town rivals Victory 1-0 to claim its second championship. Soccer fans returned to Richmond after the game but police said there were no arrests. Anyone who witnessed any incidents, has information or phone vision, is urged to contact Crime Stoppers on 1800 333 000 or via www.crimestoppersvic.com.au.