In Poznań, western Poland, nine firefighter cadets were injured after an explosion during class. A spokesman for the academy said that the incident happened whilst students were learning about the “physico-chemistry of combustion and fire extinguishing agents”.

Nine trainees were injured with eight requiring hospital treatment for first and second-degree burns. The class of twenty, said the spokesman, was under the supervision of an experienced teacher making the cause of the accident all the more mystifying. Police investigators have now been called.

Officers are also investigating an overnight blaze in Bytom, southern Poland, that destroyed ten buses at a depot. Arriving nine minutes after the fire was reported, firefighters were able to save fifty other vehicles.

Finally, in Grodzisk Mazowiecki high school in central Poland, students taking an English exam found themselves saved by the fire bell after a fire broke out on the roof of a school. Sixty students were evacuated after a fire was reported just as their exam neared its conclusion.

Ten fire crews were called to the scene and no injuries were recorded. The students will now have to re-sit the exam in June.