A missile that killed two people in Poland may have been fired by Ukraine at an incoming Russian projectile, according to intelligence shared in a meeting of G7 and Nato leaders on Wednesday.

Findings from initial investigations discussed in the emergency meeting on the sidelines of the G20 summit in Bali, Indonesia, suggest that the weapon could have been fired by Ukraine’s air defence system at a Russian missile before landing in Poland, according to people familiar with the discussions.

Investigations are still under way and no conclusion has been drawn, the people added.

Poland has convened emergency talks with its Nato allies after what Warsaw said was a strike by a “Russian-made missile” in the village of Przewodów on Tuesday afternoon.

Photographs posted on social media showed a damaged farm vehicle lying on its side next to a large crater. Local media reported the casualties were farm workers.

President Joe Biden said on Wednesday in Bali after the emergency meeting that there was “preliminary information that contests” the missile was fired from Russia.

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“It is unlikely in the lines of the trajectory that it was fired from Russia but we’ll see,” he told reporters.

Poland’s president and prime minister did not confirm allegations that the missile was fired by Russia during a midnight news conference in which they both appeared to avoid statements that could escalate tensions with Moscow.

“There is no conclusive evidence about who fired the rocket,” said President Andrzej Duda after an emergency security meeting of the Polish government. Duda also referred to the missile strike as a “one-off incident”.

Read more: FT