Two people died Tuesday afternoon after a projectile struck an area where grain was drying in Przewodów, a Polish village near the border with Ukraine, domestic media reported.

Pentagon says it cannot corroborate reports of Russian missiles crossing into Poland at this time.

Polish Prime Minister Mateusz Morawiecki has called an emergency meeting of the country's top national security and defence officials, according to government spokesman Piotr Mueller.

Mueller did not immediately confirm the information on the missile strike but said the meeting was held due to a “crisis situation”.

A senior US intelligence official confirmed that Russian missiles crossed into Poland. The eastern European country bordering Ukraine is an EU and NATO member.

Local outlets are reporting that Polish police, the prosecutor's office and the army are on site in Przewodów. Firefighters from a local unit confirmed an explosion had killed at least two people. 

"Firefighters are on the spot, it's not clear what has happened," said Lukasz Kucy, officer on duty at a nearby firefighters' post.

Przewodów, a village of 710 residents in eastern Poland, is situated some 130 kilometres southeast of the regional capital Lublin and 7 kilometres from Ukraine.

Russia was pounding cities across Ukraine with missiles on Tuesday in attacks that Kyiv said were the heaviest wave of missile strikes in nearly nine months of war.