Violent clashes during an anti-lockdown rally Saturday in Australia's second most populous city left several police officers injured and saw hundreds of protesters taken into custody.
Officers used pepper spray and made over 200 arrests in Melbourne as several hundred attendees flouted stay-at-home orders and marched through an inner-city suburb.
The illegal gathering came as the city is going through its sixth lockdown since the pandemic started, with the wider state of Victoria reporting over 500 cases of COVID-19 on Saturday.
Police said six officers were taken to the hospital after they were pelted with projectiles and trampled in clashes with the crowd of around 700 people.
"What we saw today was a group of protesters that came together, not to protest freedoms, but simply to take on and have a fight with the police," Victoria Police Commander Mark Galliott told media.
Police attempted to reduce access to the center of the city, blocking roads and stopping public transport in a bid to avoid a repeat of violent scenes at a rally that drew thousands last month.
But marchers then relocated, with footage from one incident showing a crowd charging through a police line as scuffles erupted along a tram route.
Huge numbers of police managed to deter a similar gathering in Sydney, with officers swarming a park where the protest had been due to go ahead.
New South Wales Police said they arrested around 20 people in the city, mainly across the public transport network, while several others were arrested in smaller gatherings around the state.
Both cities are enduring lengthy lockdowns as authorities race to vaccinate a way out of restrictions amid growing outbreaks.
Australia successfully pursued "COVID-zero" for most of the pandemic, enabled mainly by closed international borders and restrictions on movements.
But the arrival of the delta variant plunged its two largest cities back under stay-at-home orders earlier this year, and authorities are now aiming for a 70% vaccination rate before further easing lockdowns.