There are no reports of anyone being injured and Victorian police told reporters the general public was not believed to be at risk.
A man has been arrested after almost 40 suspicious packages were discovered at foreign embassies and consulates across Australia.
It is understood the envelope, which looked like a normal letter, was addressed to the Consulate-General of Pakistan.
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Hazmat and fire crews are seen outside the Indian and French Consulates on St Kilda Road in Melbourne.
AAP reported at least two foreign consulates in Melbourne did not contact authorities about suspicious packages in their possession until they received an email from the government.
Detectives allege the man sent 38 parcels to consulates and embassies in Melbourne, Canberra and Sydney, with a substance suspected to have been sourced from his Shepparton home.
The packages were not believed to be risky, but police, fire crews and forensic teams were urged to use breathing apparatus as they documented and double- or triple-bagged the materials for further testing.
He was due to appear in Melbourne Magistrates Court later on Thursday.
Police have recovered 29 packages so far, with forensic testing to be undertaken to determine the nature of the substance.
"After learning of incidents at three offices in Sydney and Canberra, DFAT sent a note to all diplomatic missions in Canberra on January 8 alerting them to the possibility of suspicious packages being delivered by mail", a spokesman said.
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