The remains of a "military object" were found in a forest in northern Poland on Thursday, which a broadcaster said authorities believed could be part of a missile stuck in the ground.
The defense and justice ministries did not identify the object found near the city of Bydgoszcz, or say how long it had been there.
Private broadcaster RMF FM reported that it was an air-to-surface missile measuring several meters, stuck in the ground, with its head missing. It identified no sources for its report.
Poland has been on alert for possible spillover of weaponry from the war in neighboring Ukraine, especially since two people were killed near the border last November by what Warsaw concluded was a misfired Ukrainian air defense missile.
The military object found in a forest in Poland was probably not fired from another country, but belonged to the Polish army, private broadcaster RMF FM reported on Thursday quoting unofficial information.
The remains of a military object were found in northern Poland near the city of Bydgoszcz, Poland's defense ministry and justice minister said on Thursday, confirming earlier media reports of the discovery of some kind of object in the area.
It was not immediately clear what the object was, where it came from, or how long it had been there. The justice minister said it was found in a forest.
"The Military Department of the District Prosecutor's Office in Gdansk, under the supervision of the National Prosecutor's Office, initiated proceedings regarding the remains of an aerial military object found in a forest several kilometers from Bydgoszcz," Justice Minister Zbigniew Ziobro said on Twitter.
Discovery of the object
The defense ministry said on Twitter the remains of "an unidentified military object" were found in the environs of the village of Zamosc near Bydgoszcz.
"The situation does not threaten the safety of residents. The location of the discovery is being investigated" by Polish officers and military police, the ministry said.
The area where the object was found is hundreds of kilometers from Poland's borders with Ukraine, Belarus and the Russian exclave of Kaliningrad.
The military police, regional police, the mayor of the village of Zamosc, the Gdansk prosecutor's office and a government spokesman all declined to comment further.