The drone was discovered on Monday and has now been examined, according to military prosecutor Bartosz Okoniewski.
It contained a warhead with a detonator, he says, without revealing the drone's equipment or possible targets.
Defence Minister Wladyslaw Kosiniak-Kamysz confirmed that the Gerbera-2 drone was found in the sea off the village of Rusinowo in northwestern Poland. The Szczecin prosecutor's office is launching an investigation into the incident, it was announced on Wednesday.
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Poland borders Ukraine and the Russian exclave of Kaliningrad. Polish airspace and territory have been repeatedly violated by drone flights since Russia launched a full-scale invasion of Ukraine in 2022.
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