The crowd, including families with children, stood in the rain outside the city's Town Hall in solidarity with Kurds affected by Turkey's incursion in the region, which started after the United States' recent withdrawal from north-eastern Syria.

Warplanes and artillery have hit Kurdish militia targets in Syria in an offensive ordered by Turkish President Tayyip Erdogan that has killed hundreds of people, forced tens of thousands to flee and turned Washington's establishment against US President Donald Trump.

Holding aloft Kurdish flags, the crowd chanted "Shame, shame Donald Trump" and "Shame, shame Erdogan".

Earlier this week Australia's Prime Minister Scott Morrison said he had expressed "deep concern" to both the US and Turkish government's that the incursion could lead to the resurgence of Islamic State.

Zirian Fatah who attended Saturday's rally with his young daughter, said the time for words was over.

The 33-year-old father-of-two, originally from Kurdistan, urged the Australian government to propose a resolution to the United Nations to impose a no-fly zone for Turkey.

Mr Fatah, who is vice-president of the Kurdish Lobby Australia, said Mr Erdogan's actions would create a "terror corridor" which could directly affect the West.

He told AAP: "The reality is this doesn't only affect Kurdish people or Kurdistan. This is a worldwide problem."

Continued military action in the region will result in the release of thousands of IS prisoners who had been under Kurdish control, allowing them to travel anywhere in the world, he said.

"I'd say to people not only in Sydney and Australia but people all around the world especially in the west...once Erdogan invades further in, these 10,000 IS detainees will be released and you never know where they will pop up.

"And please don't tell us we didn't tell you, because they will pop up in any corner and every corner of the world as IS has planned all along."

Australian Associated Press