In a pyrotechnic facility, the outbreak of fire followed by a broader blaze took place within an intermediate storage room during a handling operation. A technician placed a container filled with lighting devices, which had just been assembled and were awaiting definitive packaging, on top of other containers. When he left the premises with another container, it got caught and spilled the contents of the one he had just deposited. The lighting flares, which had been partially assembled and hence more sensitive to mechanical aggressions, ignited due to the shock and spread fire to the entire storage facility. The premises sustained major damage (insulation, roof, access door). The fire could be controlled using internal resources; the adjacent rooms remained intact. No injuries were reported. The operator modified the facility’s operating protocol (i.e. order of rocket assembly) and updated safety guidelines, in addition to building awareness among personnel regarding handling-related risks.