Students at Calwell High School, Canberra High School and Curtin Primary School were evacuated on Wednesday as the school bomb hoax saga continued - disrupting first week classes across eight Canberra schools.
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The ACT Education Directorate has, however, asked all ACT school staff and students be alert for any suspicious activity and respond to any threats by calling 000.
While now understood to be part of an international hoax, ACT Police were called to the schools as a precaution.
Canberra High School and Curtin Primary School received calls on Wednesday morning and students were evacuated. Calwell High School was temporarily evacuated on Wednesday afternoon. Students at all three schools were later allowed back into class.
An ACT Policing spokeswoman said they were investigating the "veracity" of the threats.
It comes a day after five Canberra schools were evacuated after a series of threats.
Lanyon High School, Forrest Primary, and Kingsford Smith School in Holt were all temporarily evacuated on Tuesday before Richardson and Miles Franklin also received specific threats requiring students to be evacuated.
Over the past week, schools across Australia and around the globe have received specific threats of harm.
Schools across Britain, the US, France, Japan, Holland, Norway and Guam have received similar threats, although authorities have not confirmed any links.
NSW Police said the threats appeared to come from overseas "with no credible evidence they could be carried out here."
"There is no evidence these are anything other than hoaxes designed to cause unnecessary disruption and inconvenience ... The purpose and exact source of the threats remains unknown," it said in a statement.
It's understood authorities suspect the hoax is the work of mischief-making hackers who have no capability of carrying out attacks but are reasonably sophisticated in their use of technology and the dark web.
Schools appear to have been picked randomly and their locations reveal no patterns.
The phone messages contain no religious, political or ideological references that might link them to a particular terrorist group.
Neil Fergus, chief executive of Intelligent Risks, said the situation puts authorities in a bind. Schools cannot ignore the risk but the mass disruption is exactly what the perpetrators want.
