Έκρηξη σε γυμνάσιο στο Κάρλσταντ της Σουηδίας

epa05139922 Police officers and rescue forces standt outside the Tingvalla secondary school in Karlstad, Sweden, 02 February 2016. A loud explosion was heard in the centre of Karlstad in Sweden. Local authorities say the blast came from inside the secondary school Tingvalla. EPA/TOMMY PEDERSEN SWEDEN OUT (File: 16224872.jpg )