Australian police believe explosives found on Sydney's outskirts were evidence of a deadly escalation in a campaign of antisemitic arson and graffiti crimes that has been waged in major cities for months.

Australian police have said they foiled a potential antisemitic attack on discovering a trailer packed with explosives in northwest Sydney, alarming the Jewish community following a spate of arson and graffiti incidents.

Sydney restaurateur Judith Lewis couldn’t save the mezuzah, a framed parchment inked with Hebrew prayers, that was hanging in her family’s café when arsonists set it alight in the early hours one Sunday in late October.

Australian police say they suspect explosives stashed on Sydney’s outskirts were evidence of a deadly escalation in a campaign of antisemitic arson and graffiti crimes that has been waged in major cit

The explosives located in a caravan could have caused a 'potential mass casualty event', authorities have said.