"While it is not known what caused the explosion, according to the school students the teenagers blew an object that looked like a cigarette lighter causing blown out windows and damage the frame. Shrapnel wounded three people. Some children are in the state of shock," said a police source, as reports Ukrinform.
According to the chairman of the independent EMS trade union Anatoliy Sidorenko, two students were hospitalized and a teacher refused hospitalization.
One of the teenagers has a blunt abdominal trauma and suspected head injury. The second child has cut wounds of the head and limbs.
Police and prosecutors are on site.