The incident occurred on the grounds of the soon-to-be-closed Tomisławice brown coal mine near the town of Konin, according to reports.
A military police statement said investigators were working at the site under the supervision of a prosecutor.
The find, reported by a mine worker at around 11 a.m. in the village of Galczyce in Poland’s western Wielkopolskie region, posed no threat to civilians, authorities said.
State broadcaster TVP Info cited sources as saying it was a Gerbera military drone. Gerbera drones are produced in Russia and are used as decoys to overload air defence systems.
Deputy Prime Minister and Defence Minister Władysław Kosiniak-Kamysz said he had been briefed on the discovery by military commanders.
“The military police, together with the police, are clarifying the case," Kosiniak-Kamysz told reporters during a briefing in the Baltic city of Gdańsk.
He added that earlier on Thursday Pål Jonson, Sweden’s defence minister, had informed him of a drone that had violated Swedish airspace and was likely conducting a mission on behalf of "our adversaries from the east."
Kosiniak-Kamysz said the Galczyce incident would be thoroughly investigated.
Poland has been on alert for airspace incursions since more than 20 Russian drones entered its airspace in September last year, with some later found in the east of the country.
(gs)
Source: IAR, PAP, TVP Info, Reuters