Overseas pranksters are believed to be responsible for a series of intimidating calls that were made to schools in the state’s South and North-West on Monday and Tuesday.

The threats come in the form of a computer-generated phone call, however, Tasmania Police has refused to detail how many schools were targeted and the extent of the threats ‘‘because hoaxers aim to cause maximum disruption and public fear, and media coverage is one of their key methods of achieving this’’.

Similar hoax calls made to schools in Victoria, NSW and Queensland in recent days included threats of shootings and bombings inside school grounds.

Police have reiterated the threats have no credibility.

‘‘We are working with our interstate policing colleagues on the investigation,’’ police said on Wednesday.

Despite the threats, school continued as normal across the state.

Education Minister Jeremy Rockliff confirmed only a small number of Tasmanian government schools had been impacted.

‘‘The safety of staff and students is always a priority, and as such, the Department of Education is liaising with police, in line with procedures in place for incidents such as this,’’ he said. 

Tasmanian Association of State School Organisations president Ant Dry said on Wednesday that he had not heard from any Tasmanian school about receiving

 threats. 

‘‘These hoax calls are ridiculous, but they have to be taken seriously because one day there might be an element of truth in them,’’ he said.