Chilling photo pro-Palestine protesters carry down the streets of Australian city

Protesters have marched through Australian capital cities waving Hezbollah flags and carrying photos of the organisation's recently killed leader.

Thousands took to the streets in Sydney and Melbourne on Sunday to walk in support of Palestine and Lebanon, amid the conflict in the Middle East.

Small groups of young men, many masked, were seen at the rallies in each city waving the red and green flags of Hezbollah, a militant and political group hailing from Lebanon, which has been listed as a terrorist organisation in Australia.

Others, including both adults and children, held framed photos of Hezbollah's leader Hassan Nasrallah, who was killed by an Israeli air raid overnight.

Liberal Senator James Patterson said the sight of Hezbollah flags at rallies in Melbourne and Sydney were 'disturbing' given it is designated by Australia as a terrorist organisation.

Islamic community leaders also said this group was not representative of the Muslim community in Australia or the protest, which was calling for Israel to stop military operations in Gaza and Lebanon, where they are fighting Hezbollah.

'They are definitely a minority. An absolute, tiny minority,' Islamic Council of Victoria's president Adel Salman told The Australian .

'For my own experience, my knowledge of the community, there is no support of Hezbollah, no love of Hezbollah, right now, this is all about support for the Lebanese people.

'The community is concerned about the escalating violence, but our concern primarily is about what's happening in Palestine, in Gaza, that's still the main focus in the community.

'And we have to be careful we don't reduce the battle to one between Hezbollah and Israel, effectively this is an attack on Lebanon that is a sovereign country ... and people are outraged.'

Home Affairs Minister Tony Burke blasted those showing 'any indication of support' for a terrorist organisation, and threatened to cancel their visas.

'It draws the immediate attention of our security agencies. There is a higher level of scrutiny if anyone is on a visa. I have made clear from day one, that I will consider refusing and cancelling visas for anyone who seeks to incite discord in Australia,' he said.

Overnight, Israeli forces said Nasrallah had been killed during a massive air strike on Beirut, reportedly using 5,000-pound bunker-busting bombs.

Israel is currently fighting on two fronts, with the Hamas fighters in Gaza and the Iranian backed militia Hezbollah in Lebanon.

Foreign Minister Penny Wong on Sunday reiterated her call for Australians to flee Lebanon as soon as they can and said she was concerned about escalating violence.