The blast occurred while firefighters and police were responding to an earlier fire at the facility, which was closed for the summer holiday, preventing casualties.
Emergency Response and the KNDS Ammo Italy Plant Blast
A massive explosion shook the industrial site near Colleferro, southeast of Rome, sending towering plumes of smoke into the air that could be seen and heard for kilometers around. Police and firefighters were already on the scene managing an active fire when the secondary detonation occurred.
The facility, formerly known as Simmel Difesa, is operated by KNDS Ammo Italy, a subsidiary of the Franco-German defense group KNDS. According to reporting from Italian daily Corriere della Sera, the initial fire broke out at a compaction press used for explosive powder before escalating into the major blast.
Mayor Giulio Calamita Confirms No Casualties During Summer Shutdown
Local authorities quickly moved to reassure residents as emergency crews launched complex operations at the industrial site. Employees had taken shelter in secure areas on the facility grounds, and Italian media outlets confirmed there were no casualties reported from the incident.
Colleferro Mayor Giulio Calamita addressed the public and reporters to emphasize that the emergency remained contained. The situation is under control
, Calamita told reporters at the scene.
Calamita also took to social media to urge calm and combat misinformation circulating online, specifically warning against false comparisons to a devastating historical incident at the same location. The fright is great, but right now it is essential to keep calm and, above all, to avoid spreading untrue information, such as that relating to the 2007 accident which is once again circulating
, Calamita wrote on Facebook, referencing an October 2007 explosion at the plant that killed one worker and injured 13 others.
Manufacturing Profile and European Defence Frameworks
The plant plays a critical role in European defense supply chains, manufacturing medium- and large-caliber ammunition tailored for land and naval defense systems. In addition to conventional munitions, the facility produces solid propellants utilized in aerospace launch vehicles, according to corporate disclosures.
European Union documentation highlights that the company is integrated into broader continental security efforts, operating as a contractor on European Defence Agency 155-mm ammunition framework agreements established in 2023.
Corporate representatives confirmed that investigation teams are actively evaluating the grounds. The circumstances surrounding the incident are currently being investigated and assessed by the teams on site
, KNDS stated regarding the accident.
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