A fire at a Polish plant that makes drone parts for Ukraine's and Poland's militaries is being investigated as possible sabotage by a foreign intelligence service, Militarnyi reported. Poland's National Prosecutor's Office opened the case on two counts: foreign-intelligence activity against the country and a terrorist offense.
Fires and break-ins like this fit a widening pattern — the factories and supply lines that keep Ukraine armed are increasingly targets far from the front line. Across the continent, prosecutors keep opening the same kind of arson case against plants tied to Ukraine's defense.
A masked intruder and a two-hour fire
The fire started shortly after midnight on 31 August in the assembly hall of the WB Electronics plant in Skarżysko-Kamienna and spread to the storage rooms. Five crews put it out in under two hours. No one was hurt, but the storage rooms were destroyed, leaving at least 15 million zloty ($4 million) in damage. The plant had no permanent guards on site; a security company monitoring it remotely reported the fire.
Prosecutors say the blaze was set deliberately with a planted charge of flammable material, and no one has been charged. Security cameras recorded a masked person who climbed a fence and got onto the site.
Why Poland is looking at Moscow
Czesław Mroczek, deputy head of Poland's Interior Ministry, told RMF FM radio that many signs point to arson, and that a Russian trail is the obvious inference. An attack on the defense industry can suggest Russian involvement, he said, since European states have faced sabotage for years while backing Ukraine. Mroczek said protection plans for key defense plants must be richer than what this site had. No one has been detained, and investigators are still tracing how the intruder got in and who may have ordered it.
Explore further
After CIA head’s visit to Moscow, Poland’s PM warns Russia is preparing to escalate war. He puts critical window at seven or eight months
What the plant actually makes
WB Electronics is the core of WB Group, Poland's biggest private arms holding, whose firms build reconnaissance and strike drones such as the FlyEye and the Warmate. The Skarżysko-Kamienna site itself makes drone components for unmanned systems, used by both Polish and Ukrainian forces. Ukraine received FlyEye drones back in 2022 under its Army of Drones program, and in 2025 WB Group launched drone production inside Ukraine.
Connexion
