Polish Prime Minister Donald Tusk has said an object that crashed into a field in eastern Poland in the early hours of Thursday was probably a Russian missile.

The unidentified object caused a 10m-wide (33ft) crater a short distance from the village of Tarnawa Kolonia, about 100km (62 miles) from the border with Ukraine during a Russian attack on the city of Lviv.

“All the indications are that it was a Russian Kh-101 ballistic missile, but we want to be 100% certain about the type of missile and who launched it,” Tusk said during a specially convened meeting in Lublin.

Ukraine’s acting Foreign Minister Andrii Sybiha said earlier on Thursday that a Russian Kh-101 cruise missile had “crossed into Poland as part of Russia’s massive strike against Ukraine, violating Nato airspace”.

Defence Minister Wladyslaw Kosiniak-Kamysz said about 20 objects were seen close to Polish airspace overnight and pyrotechnical analysis was being carried out to determine the identity of the object that fell near Tarnawa Kolonia.

Poland’s military had detected the object at about 03:40 on Thursday (01:40 GMT) and had sent an F-16 fighter jet to intercept it before it disappeared minutes later from radar systems.

Tusk said there were no reports of casualties but the incident was being treated as serious.

The Polish leader had met Ukrainian President Volodymyr Zelensky in Lublin the previous evening as Zelensky was returning from talks with US President Donald Trump.

This breaking news story is being updated and more details will be published shortly. Please refresh the page for the fullest version.

You can receive Breaking News on a smartphone or tablet via the BBC News App. You can also follow @BBCBreaking on X, external to get the latest alerts.