Zdnet - Australians, scared that they may be an assassination target, have called police for help after receiving SMS death threats, but it is just an old hoax.
(Culture, Phones)
I would report it. Empty threat or not, it's not okay to go about threatening peoples lives. Especially since they seem to be trying to extort money from people.
At the least, call a non-emergency number and report the number/email.
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At the least, call a non-emergency number and report the number/email.
Australia is badass