The missile blast that killed two people appears to be an “unfortunate accident” and not an “intentional attack”, Poland’s president has said.

Andrzej Duda tweeted that officials had “no proof at the moment that it was a missile fired by the Russian side”.

He added: “There are many indications that it was an air defence missile, which unfortunately fell on Polish territory.”

On Wednesday morning, US President Joe Biden cast doubt previous claims the missile, which hit a grain silo in Przewodow, was fired by Moscow.

Polish prime minister Mateusz Morawiecki said Poland was still analysing the possibility of launching the NATO Article 4 procedure, but it seemed it may not be necessary to use that measure.

NATO Secretary General Jens Stoltenberg said in a statement to media: “Yesterday’s explosion took place as Russia launched a massive wave of rocket attacks across Ukraine.

“An investigation into this incident is ongoing, and we need to await its outcome.

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“But we have no indication this was the result of a deliberate attack and we have no indication Russia is preparing offensive military actions against NATO.

“Our preliminary analysis suggests that the incident was likely caused by Ukrainian air defence missile fired to defend Ukrainian territory against Russia cruise missile attacks.

“But let me be clear – this is not Ukraine’s fault. Russia bears ultimate responsibility as it continues its illegal war against Ukraine.”

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