Protesters clashed amid a heavy police presence as dozens converged on Parliament House as part of Reclaim Australia rallies and counter-demonstrations across the country on Sunday.

More than 100 anti-racism supporters gathered outside Questacon in Parkes about 11am to oppose members of the right-wing group Stand Up Australia Canberra, formerly known as Reclaim Australia, who gathered on the other side of the National Library.

The counter-rally was organised by the Canberra Anti-Racism Network to show their opposition to the "racism and Islamaphobia" it said the group promoted.

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