Police have released images as they seek to identify several men who were part of a violent anti-lockdown protest in Melbourne on Saturday.
Victoria Police said 21 officers were injured in clashes with protesters, with one officer pushed to the ground before being punched and kicked.
Officers arrested more than 200 people and issued more than $1 million in fines to people who attended the demonstration.
Some of the images released by Victoria Police appear to come from police body cameras.
Earlier this week Chief Commissioner Shane Patton said he had received intelligence that right-wing extremists were involved in the protest, which involved around 4,000 people.
"It was a mixture of a range of people with no clear leadership, just many people came in with an intention to confront police and with anger and confrontation on their mind," he said.
"We had marbles thrown at us, stubbies thrown at us, flares thrown at police officers. It was a disgrace what occurred, and we can't allow it to happen again."
Chief Commissioner Patton confirmed police used new anti-riot weapons against protesters for the first time, including squash ball-sized rubber rounds.
Police Minister Lisa Neville said she supported the response by police.
Police are urging anyone who recognises the men in the images to contact Crime Stoppers on 1800 333 000.
