Prime Minister Donald Tusk has said that a fire at a Polish factory supplying drone components to Ukraine was an act of sabotage, as Europe grapples with a growing wave of suspected Russian hybrid attacks. The blaze broke out overnight from Sunday into Monday at a facility operated by WB Group, one of Poland’s largest privately owned defense companies, in the south-central city of Skarżysko-Kamienna. The plant supplies drone parts to the Polish and Ukrainian militaries. Speaking during a cabinet meeting on Wednesday, Tusk described the incident as “a deliberate arson attack, an act of sabotage.” Prosecutors had previously said they were investigating the fire as a possible “terrorist crime” carried out on behalf of a foreign intelligence agency. Investigators believe the blaze was started by placing a device containing flammable material at the facility. Storage rooms were destroyed, causing at least 15 million zloty (€3.5 million) in damage. No one was injured, and the plant was not operating at the time of the fire. No suspects have so far been charged. Another defense-industry blaze