Police say overseas hackers may be behind hoax threats

Police in Australia investigating threatening phone calls that led to the evacuation of more than 30 schools in recent days said on Wednesday they suspected the hoax calls originated overseas and were part of a sophisticated hacking system.

The calls, which began last Friday, have made threats of bombs or shooters at schools in at least three states and the Capitol Territory.

Occurring almost daily since, the calls appear to have been automated, stored on servers, and unleashed in batches over the Internet, according to authorities.