An international hacking gang who claim to be behind some of the hoax bomb threats at Australian schools claim they are about to attack again.

On every school day since Friday, dozens of schools across the country have been evacuated after receiving similar computerised phone messages warning of a device on school grounds.

A group calling themselves Evacuation Squad have claimed responsibility for some of the attacks, and say they are just about to launch more. However, they also claim some attacks in Australia have been the work of copycats.