China has called for calm following the missile blast that killed two people in a Polish village near the border with Ukraine.
Foreign ministry spokeswoman Mao Ning told a press briefing: "Under the current situation, all relevant parties should stay calm and exercise restraint to avoid escalation of the situation."
Earlier, France urged "utmost caution" in assessing where the missile had come from. President Biden said it was "unlikely" to have been fired from Russia.
Britain's Sunak has not offered a public view himself on who was responsible, but Downing Street are not seeking to disagree with the US president's assessment.
Other countries have also been giving their reaction:
Estonia president Alar Karis said Estonia saw this as an isolated incident but said the war had to be stopped as soon as possible.
Turkish President Reccep Tayyip Erdogan said he respected Russia's statement denying it was behind the incident and believed Moscow had "nothing to do with it".
Finland's Foreign Minister Pekka Haavisto said it was important to know the details of the incident and "act accordingly".
Meanwhile, European Commission chief Ursula von der Leyen said G7 and Nato representatives stood ready to assist Poland in its investigation
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