German police detained a woman in Berlin and a man over a fire that struck a Polish Starlink internet station in September, private broadcaster RMF FM reported Tuesday, citing unnamed sources.
Earlier, Polish prime minister Donald Tusk said on Monday that Germany detained two Turkish men suspected of setting fire to the station in central Poland, calling it "another act of hybrid warfare".
Ukraine's allies have accused Moscow of "hybrid" attacks including drone and missile strikes against countries backing Kyiv as it fights off Russia's invasion.
According to RMF FM, a Polish broadcaster, the woman may have been acting as a driver for the two men, and "assisted with the logistics of the sabotage operation".
It said prosecutors would assess the extent of her involvement and whether to seek her extradition.
The broadcaster added that the role of the fourth suspect, a man, is "also under investigation".
The Polish police and National Prosecutor's Office did not immediately respond to AFP's requests for comment.
RMF FM did not give either of the new reported detainees' nationalities.
Polish interior minister Marcin Kierwinski said the two Turks faced charges of "sabotage, espionage on behalf of a foreign intelligence service".
The Starlink station, owned by state-owned telecommunications company Exatel, is used, among other things, to transmit internet traffic through Poland, including to Ukraine, according to the digital affairs minister, Krzysztof Gawkowski.
It is also used by SpaceX systems that provide connectivity via Starlink terminals.
The fire broke out overnight in late September, and the station was still operational even after the blaze.
The following day, Gawkowski told public broadcaster TVP Info: "This act of sabotage was deliberately designed to disable the station ... disrupting internet access for various institutions, including the Ukrainian army."
Poland, a NATO and EU member state along the alliance's eastern flank, has accused Russia of "sabotage" on several occasions since Moscow's full-scale invasion of Ukraine in 2022.
Poland has become the main hub for transporting Western military and humanitarian support to Kyiv.