Police have received calls today from WA residents who have received threatening text messages and emails.
"Sum1 paid me to kill you. Get spared, 48hrs to pay $5000. If you inform the police or anybody, death is promised. E-mail me now: email@example.com" one of the messages said.
A police spokesman said there was no need for anyone receiving this message to be alarmed or to contact police.
"Please delete the message and do not pay any money," the spokesman said. "This hoax has been received by hundreds of people throughout the country."