KYIV, Ukraine >> Poland demanded an explanation from Russia on Sunday after one of its missiles strayed briefly into Polish airspace during a major missile attack on Ukraine, prompting the NATO member to activate F-16 fighter jets.

It was Russia’s third big missile attack on Ukraine in the past four days, and the second to target the capital, Kyiv.

The governor of the Lviv region, Maksym Kozytskyi, said on the Telegram platform that critical infrastructure was hit, but he didn’t specify what precisely was struck. No deaths or injuries were reported.

Later, authorities said that rescuers had just put out a fire at a critical infrastructure facility in the Lviv region, which had been attacked with missiles and drones at night and in the morning. The head of Kyiv’s military administration, Serhiy Popko, said Russia used cruise missiles launched from Tu-95MS strategic bombers. An air alert in the capital lasted for more than two hours as rockets entered Kyiv in groups from the north.

According to preliminary data, there were no casualties or damage in the capital, he said.

Armed Forces Operational Command of Poland, a member of NATO, said in a statement that there was a violation of Polish airspace at 4:23 a.m. local time by one of the cruise missiles launched by Russia against towns in western Ukraine.

The object entered near Oserdow, a village near the border with Ukraine, and stayed in Polish airspace for 39 seconds, the statement said.