Tens of thousands of protesters around Australia have voiced concerns over a ceasefire holding in Gaza without further bloodshed as pro-Israel supporters await the exchange of Hamas-held hostages.

Among the pro-Palestine protesters that turned up in capital cities were Australians back home after being detained in Israel for seeking to deliver aid to Gaza during a naval blockade.

Juliet Lamont, whose boat reached 32km off Gaza's coast, said Prime Minister Anthony Albanese needed to distance the country from "the Trumpian bully-boy death cult".

Her colleague Abubakir Rafiq held back tears as he recounted being held in a cell with 83 other men in Ketziot prison in Israel and drew attention to thousands of Palestinians inmates in Israeli jails.

"What about the 10,000 Palestinian hostages

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