"I spoke with President Andrzej Duda of Poland to express my deep condolences for the loss of life in Eastern Poland and offer our full support for Poland's investigation of the explosion," Biden wrote on Twitter.
AKBAR NUGROHO GUMAY/POOL/PAP/EPA

US President Joe Biden has offered his “full support and assistance with Poland’s ongoing investigation” into an apparent missile explosion near the Ukrainian border on Tuesday.

“I spoke with President Andrzej Duda of Poland to express my deep condolences for the loss of life in Eastern Poland and offer our full support for Poland’s investigation of the explosion,” Biden wrote on Twitter. “We will remain in close touch to determine appropriate next steps as it proceeds.”

A Russian-made missile fell on the village of Przewodow in Poland’s eastern Lubelskie province on Tuesday afternoon, killing two Polish citizens. Foreign Minister Zbigniew Rau summoned Russia’s ambassador to explain the incident.

US Secretary of State Antony Blinken expressed his condolences to Rau over the loss of life, the State Department reported, adding that the American diplomat had raised the issue in talks with his Ukrainian counterpart, Dmytro Kuleba.

President Andrzej Duda told media on Tuesday night that “we have no clear evidence at the moment as to who fired the rocket, investigations are being conducted.”