Stoltenberg is asked whether the explosion in Poland represented a failure of Nato defences.

He gives a robust response, saying the missile hit didn't have the "characteristics" of an attack, which "explains why the actions were what they were".

He reiterates that preliminary evidence is suggesting the blast was caused by a Ukrainian air defence missile.

Polish president says missile that killed two was probably Ukrainian air defence.

The Polish president has said there is no sign that the missile that hit Polish territory late on Tuesday was part of an intentional attack.

President Duda says it's "very likely" that a missile explosion was caused by Ukrainian air defences

The Nato chief Jens Stoltenberg, who is holding a press conference, also says the incident in Poland was "likely" caused by the activity of Ukraine's air defence systems.

Two people were killed after a missile landed in eastern Poland near the Ukrainian border following a wave of Russian strikes across Ukraine.

Earlier, PM Rishi Sunak said the UK and its allies were trying to establish the facts about the blast.

US President Joe Biden has said it was "unlikely" that the missile was fired from Russia.

The American reaction earned rare praise from Russia - with a Kremlin spokesman describing it as "restrained and professional".