Polish armed forces say Russian drones have been 'downed' - the first time the Nato country has directly engaged Russian assets in its airspace since the Ukraine war started in 2022.
Polish and Nato aircraft were deployed, with authorities saying they began operations in Polish airspace early on Wednesday morning.
The country's prime minister, Donald Tusk, is at the scene of the operations, defence officials say.
Tusk previously tweeted that an operation "related to multiple violations of Polish airspace" was under way.
The scale of the incursion by Russian drones is new territory for Poland - and for Nato.
Poland also shut down four airports as reports of the objects first emerged.
The country says it shot down drone-like objects which violated its airspace during a Russian attack on Ukraine
Poland's president will soon be chairing a National Security briefing with key officials.
The Polish PM says the operation is "ongoing" and he is in contact with the Nato chief; he will also be conducting an extraordinary cabinet meeting in an hour.
The Polish military says the incident is an "unprecedented violation of Polish airspace", an "act of aggression that posed a real threat to the safety of our citizens".
Citizens in three regions along the border with Ukraine, including Mazowieckie where the capital Warsaw is located, have been urged to stay home and shelter.
