An organiser of an anti-government rally says derogatory signs levelled against the Australian prime minister, including one saying ''abort Abbott'', are the responsibility of protesters.
Melbourne's March in March rally on Sunday drew tens of thousands of people angry with federal government policies on a raft of issues including indigenous rights, education, asylum seekers and climate change.
Similar rallies were held in other cities across Australia.
Melbourne organiser Sarah Garnham, who was protesting against education cuts, said she wasn't willing to apologise for the anti-Tony Abbott signs held up by protesters.
''Protest organisers don't have control over signs,'' Garnham said.
''It's a lively way of expressing extreme anger.''
However, Garnham said she thought a sign saying ''ditch the witch'', aimed at former Australian prime minister Julia Gillard during a 2011 anti-carbon tax rally, was sexist and offensive.