No injuries were reported.
Airport spokesman Brian McClean said that the flight from Chicago en route to Warsaw with 248 people on board landed safely at 11:35 a.M local time. He said the landing was made at the request of the captain.
LOT spokeswoman Barbara Pijanowska-Kuras said the emergency landing was required according to safety procedure after the crew received a warning from the firefighting system in the luggage compartment.
The airport declared a full emergency as a precautionary measure. However, officials said there was no smoke reported, making it possible to have the aircraft taxi to the main terminal building.