Telephone threats have been made to schools across Scotland, including one in Dumfries and Galloway.
Police Scotland say the threats were made to a number of schools in the Central Belt, as well as Dumfries High School.
Staff at the school immediately contacted the police, who went to the school to assess the risk.
Police say the threats are part of an emerging trend across the UK in recent weeks.
They say there was "nothing to indicate that this was a substantive threat", and that pupils' learning was not therefore disrupted.
However, the police say they will conduct a "significant investigation".