Police have used capsicum spray and made a number of arrests as they sought to move on protesters camped near the National Library in Canberra.
It is understood as many as four people were arrested as police moved through the camp issuing orders.
One man was also seen with a bandaged head being taken away by ambulance.
It is the third day of an anti-vaccination mandate campaign, known as the Convoy to Canberra, which included a march on Parliament House on Monday and a rally outside the National Press Club on Tuesday where Prime Minister Scott Morrison was speaking.
An ACT Policing spokesperson said police were engaging with protesters and campers located near the Patrick White Lawns adjacent to the library.
"The rights of people to peacefully protest is always acknowledged by ACT Policing. However, when illegal actions take place, the people responsible will be dealt with in accordance with the law," the spokesperson said.
The National Capital Authority said in a statement it had asked the Australian Federal Police and ACT Policing to "take necessary action to enforce the laws and remove tents, camping infrastructure and vehicles from the site".
Unauthorised camping is not permitted in the parliamentary precinct or NCA-managed lands.
Organisers of a number of upcoming events, which have official permits, are seeking to set up temporary facilities in the area.
