Sunday afternoon Swedish media reported about a powerful explosion thundered near the building of the Tingvalla gymnasium, located in Karlstad, the heart of värmland County in Northern Sweden.
This writes 2 January, the Swedish edition Egrep with reference to the headmaster Christine Holmberg.
The explosion was heard across the city, with a population of 84.000 people, and resulted in a fire building, says Ola Akesson, the representative of the rescue service.
To date, nothing is reported about victims and damage.
The information is specified.