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Police are launching a criminal investigation after the embassies of Israel, the United States and Britain in Canberra were sent packages containing white powder.
Staff from the US and Israeli embassies were evacuated after the anonymous packages were received in the mail. Police later said the powder at the Israeli mission was harmless, but tests were still under way on the other two samples.
"We are treating all three as linked until we can prove otherwise, given they were received on the same day, and a crime scene has been declared," a police spokesman said.