The Finnish Safety and Chemicals Agency (Tukes) has concluded its investigation into a massive explosion that occurred at a fireworks storage facility operated by Pyrokratia Oy in Janakkala on November 5, 2025. The investigation found that the cause of the explosion was likely a firework that had been damaged during transportation or handling. This incident occurred when an employee inspected a cardboard box containing professional fireworks returned unused from a fireworks display in France. Upon touching the firework inside the box, it ignited, triggering a rapid chain reaction that set off other fireworks stored in the same container.

The fire quickly spread to several storage containers in the facility, prompting multiple emergency response units to be dispatched to the scene. In response to the fire, authorities established a danger zone extending one kilometer around the site to ensure the safety of nearby residents and workers. The response highlighted the hazards associated with handling and storing explosives, particularly in the context of large quantities of fireworks, which can present significant risks if not managed properly.

This incident serves as a reminder of the importance of stringent safety protocols in the fireworks industry and the need for thorough training for employees handling such materials. It also raises questions about the handling practices in place for storage facilities and the preventive measures needed to avoid similar incidents in the future, especially as the use of fireworks continues to be popular in various celebrations and events across Finland.