Polish prosecutors said Monday that they suspect arson by a foreign intelligence service in a fire at a WB Electronics plant in Skarżysko-Kamienna, calling the blaze a “terrorist crime” involving the “deliberate setting of a fire.”

WB Electronics, one of Poland’s largest private defense firms, makes reconnaissance drones and loitering munitions, including FlyEye and Warmate, used by Ukraine against Russian forces. The factory fire broke out in the early hours of Monday.

Security video footage shows a masked intruder entering the perimeter just before the fire started. There was no significant damage because of the rapid response by company security personnel.

This marks the latest in a cluster of unfortunate occurrences in August 2026 afflicting NATO states that seem linked to those countries’ support for Ukraine.

On 7 August, Poland detained a Russian citizen in a plot to kill a person holding U.S. and Ukrainian citizenship in Warsaw. Prime Minister Donald Tusk announced the arrest on 13 August; see Report: Poland Foils Russian Hit on Ukrainian-American 'Inconvenient' to Putin – RedState. Polish prosecutors later opened a terrorism inquiry into a separate case: a fire at a WB Electronics drone plant in Skarżysko-Kamienna on 31 August.

Poland has been the main target of Russian operations.

In June, a Russian artist whose work criticised Putin was assassinated in Poland. Soon after, the Polish security services detained the suspected killer, who they said was using a Georgian passport.

Last month, a Russian missile hit Poland during intensive attacks on Ukraine. That followed an incident last year in which around 20 Russian drones violated Polish airspace.

On the night of 4–5 August, German authorities found and disarmed an explosive-laden drone near Ukrainian Antonov cargo aircraft at Leipzig/Halle Airport. The drone struck the cargo plane but failed to detonate. A second incident took place while the investigation was underway. This time, another cargo plane was struck by a drone as it attempted to land, but the drone was not recovered. A week later, yet another explosive drone was found near Leipzig/Halle Airport.

On 13 August, a fire at a KNDS Ammo Italy factory in Colleferro was followed by a large blast. The factory makes medium- and large-caliber artillery rounds that are transferred to Ukraine. No one was killed. Italian officials said they saw no sign of a Russian link.