Russian drones were shot down after crossing into Polish airspace in the early hours on September 10, Poland’s government said.

Defence Minister Władysław Kosiniak-Kamysz said Polish and allied radar systems tracked more than 10 objects that crossed the border. “Drones that could have posed a danger were shot down. Work is underway to locate possible crash sites,” Kosiniak-Kamysz said on X.

The armed forces described the incident as an “act of aggression” that posed “a real threat to the safety of our citizens.” Polish and allied aircraft were sent to identify and neutralise the drones, the Operational Command said.

The Operational Command also warned that the military operation remained active and urged residents in Białystok, Warsaw, and Lublin provinces - which are closest to Poland’s borders with Belarus and Ukraine - to stay indoors.

Poland also closed its Warsaw Chopin Airport, the country’s biggest, as well as airports in Modlin near Warsaw, and Lublin.

“Due to the actions of state services and the military to ensure safety, the airspace over part of the country, including over Chopin Airport, has been temporarily closed. The airport remains open, but no flight operations are currently taking place,” Warsaw Chopin Airport said in a statement.

Prime Minister Donald Tusk said he was in “constant contact" with the defence ministry and President Karol Nawrocki. The president’s office is yet to issue a statement.

Poland’s armed forces had earlier reported “repeated violations by drone-type objects” during Russian strikes on Ukraine, saying the country’s air defences had been moved to the “highest state of readiness.”