Two Polish citizens have been killed after a missile landed in eastern Poland about 15 miles from the country’s border with Ukraine, Western media are reporting.

This is the first confirmed instance of the war in Ukraine having caused casualties directly in another country.

The circumstances of the explosion are not clear. It is also not known who fired the missile, and from where.

This is the first confirmed instance of the war in Ukraine having caused casualties directly in another country.

President Andrzej Duda first told reporters it was “most probably” Russian-made and that its origins were still being verified.

He later said there was no concrete evidence of who fired it, and the incident was a one-off. A statement from the Polish foreign ministry initially said the missile was Russian-made.

“We are acting with calm. This is a difficult situation,” Duda told reporters. He said Poland was raising its level of military preparedness.

Later, however, The Associated Press, quoting US officials, reported that the missile was fired by Ukrainian forces at an incoming Russian missile.