Prime Minister Anthony Albanese has repeated his call for Australians not to visit Iran, just hours after the country's ambassador departed for Tehran.

Last night at Sydney Airport, expelled diplomat Ahmad Sadegh described allegations his country was behind antisemitic attacks in Sydney and Melbourne as "baseless" in an impromptu press conference.

Before boarding his flight, Ahmad declared Australians visiting Iran were safe.

Speaking with Today this morning, Albanese was quizzed by host Karl Stefanovic whether the expelled envoy could be taken at his word.

"No, in a word," replied Albanese.

"And I hope he didn't slam the door on the way out, because it was a big decision by the government.

"No ambassador has been expelled from Australia in the post-war period. That says some

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