Chris Mason
Political editor

The G7 group of nations has released a statement on its gathering here in Bali.

The following was published by the European Commission, which was represented at the meeting:

“We condemn the barbaric missile attacks that Russia perpetrated on Ukrainian cities and civilian infrastructure on Tuesday.

"We discussed the explosion that took place in the eastern part of Poland near the border with Ukraine. We offer our full support for and assistance with Poland's ongoing investigation. We agree to remain in close touch to determine appropriate next steps as the investigation proceeds.

"We reaffirm our steadfast support for Ukraine and the Ukrainian people in the face of ongoing Russian aggression, as well as our continued readiness to hold Russia accountable for its brazen attacks on Ukrainian communities, even as the G20 meets to deal with the wider impacts of the war. We all express our condolences to the families of the victims in Poland and Ukraine.”

The G7 is made up of the US, UK, EU, Canada, France, Germany, Italy and Japan.

United Nations Secretary General Antonio Guterres is "very concerned" by the missile explosion in Poland and hopes a thorough investigation will be conducted, a UN spokesperson has said in a statement.

"It is absolutely essential to avoid escalating the war in Ukraine," spokesman Farhan Haq said.

Image source, Reuters

If you’re just joining us, here’s an update of some of the key developments in the Russia-Ukraine war in the last 24 hours or so:

• Two people have been killed in Poland after missiles landed in a village near the Ukrainian border
• While early reports suggested Russian missiles were responsible, Polish President Andrzej Duda says there is no “conclusive evidence” as to who was responsible
• Moscow has strongly denied responsibility for the blast, with its defence ministry saying the claims amount to a "deliberate provocation aimed at escalation"

• In Bali, world leaders gathered on the side lines of the G20 summit to discuss the situation, after which US President Joe Biden said it was “unlikely” that the missile was fired from Russia
• The blast came as Russia launched one of its biggest barrages of missiles against Ukraine on Tuesday, days after its troops were forced to evacuate Kherson
• The capital Kyiv was among the cities hit, with officials saying at least one person was found dead

We're now hearing from US President Joe Biden, who says it is "unlikely" that the missile responsible for killing two people in Poland was fired from Russia.

He says there is "preliminary information that contests" whether the incident in Poland was due to a missile fired from Russia.

"I don't want to say that until we completely investigate, but it's unlikely in the minds of the trajectory that it was fired from Russia, but we'll see."

Biden says that world leaders will determine the next steps after finding out what happened - following investigations taking place in Poland.

Image source, White House

As we've been reporting, G7 leaders at the G20 summit in Bali have gathered to discuss the situation in Poland. The White House called it an "emergency roundtable", and it took place behind closed doors.

One reporter asked whether US President Joe Biden could provide an update on the missile strike that killed two people in a Polish village near Ukraine.

Biden provided a monosyllabic reply: "No."

The response from Nato countries, including the White House, has been cautious and no blame has been attributed to the missile yet.

In a tweet, external, the US president said he had spoken to Polish President Andrzej Duda and offered "full support for Poland's investigation of the explosion".

Image source, Getty Images

As the G20 summit in Bali enters its last day, world leaders are meeting in the side lines to discuss explosions in Poland on Tuesday, which killed two people near the country's border with Ukraine.

From left to right you can see:

• EU Commission President Ursula von der Leyen
• Giorgia Meloni, Italy's prime minister
• German Chancellor Olaf Scholz
• French President Emmanuel Macron
• Canadian Prime Minister Justin Trudeau
• US President Joe Biden
• UK Prime Minister Rishi Sunak
• Spanish Prime Minister Pedro Sanchez
• Mark Rutte, Netherland's prime minister
• Japanese Prime Minister Fumio Kishida
• And European Council President Charles Michel

Chris Mason
Political editor

Here at the G20 Summit in Bali, everyone’s plans have been upended by what’s happened in Poland.

Leaders have been on the phone with their defence and foreign ministers – and talking to Poland.

Both US President Joe Biden and UK Prime Minister Rishi Sunak are among those who have been in touch with Warsaw.

Biden has also spoken to Nato Secretary General Jens Stoltenberg.

In the last few minutes, the leaders of the United States, the UK, the European Union, Spain, Germany, Canada, France, Japan and the Netherlands have gathered for what was described by the White House as an "emergency roundtable".

Image source, EPA

Polish Prime Minister Mateusz Morawiecki has urged people to remain calm after a Russian-made missile killed two people in a Polish village near the Ukrainian border.

"I am calling on all Poles to remain calm in the face of this tragedy... We must exercise restraint and caution," Morawiecki said after emergency government meetings in Warsaw.

He also said that Poland would increase surveillance of its airspace following the incident.

"We decided to increase the combat readiness of selected units of the Polish armed forces, with particular emphasis on airspace monitoring," he told reporters.

Image source, epa

Poland says it doesn’t have any “conclusive evidence” as to who launched the missiles that landed in a Polish village near the Ukraine border, killing two civilians.

President Andrzej Duda told reporters: "We do not have any conclusive evidence at the moment as to who launched this missile... it was most likely a Russian-made missile, but this is all still under investigation at the moment.”

The incident – which has drawn concern from members of Nato, of which Poland is a member – has led to a war of words between Kyiv and Moscow.

Russia has described claims it is responsible as a “provocation” by Kyiv aimed at drawing other countries into the conflict, while Ukraine has dismissed allegations of its own responsibility as a Russian “conspiracy theory”.

Image source, EPA

Leaders of the G7 group of democracies are arranging an emergency meeting on Wednesday in response to the missiles landing in Poland, Japan’s Kyodo news agency has reported.

A meeting between Japanese and UK leaders scheduled for the same day has been put on hold, the report says.

The G7 comprises Canada, France, Germany, Italy, Japan, the UK and the US.

Image source, EPA

Ukraine has dismissed allegations that one of its missiles landed in Poland as a “conspiracy theory” and part of “Russian propaganda”.

Kyiv’s Foreign Minister Dmytro Kuleba said on Twitter: "Russia now promotes a conspiracy theory that it was allegedly a missile of Ukrainian air defence that fell on the territory of Poland. Which is not true. No one should buy Russian propaganda or amplify its messages.”

Denis Pushilin - the Russian-appointed head of the occupied Donetsk region in eastern Ukraine - earlier said reports that a Russian missile had landed in Poland were a “provocation” by Ukraine, and an attempt to “draw additional forces into the conflict”.

Poland has so far said “Russian-made missiles” were responsible, avoiding either party to the conflict. Both sides in the war have used Russian-made munitions.

Poland’s foreign ministry has said that a “Russian-made missile” landed on its territory at 15:40 (14:40 GMT), killing two people in the village of Przewodow.

Foreign ministry spokesman Lukasz Jasina added that the Russian ambassador to Poland had been summoned to give "immediate detailed explanations" over the incident.

The statement does not say who fired the missile and both sides in the conflict have used Russian-made munitions.

Przewodow is located on Poland's border with Ukraine, and just north of the city of Lviv.

UK Prime Minister Rishi Sunak says he has spoken with Polish President Andrzej Duda regarding reports of a missile strike near the country’s border with Ukraine, which killed two people.

“I reiterated the UK’s solidarity with Poland and expressed condolences for the victims,” he says in a tweet, adding that his government will remain “in close contact” and will coordinate with Nato allies.

Sunak - who is in Indonesia attending the G20 Summit - earlier said he had spoken with his Foreign Secretary James Cleverly and Defence Secretary Ben Wallace and was working to "establish what has happened".

We reported earlier that Poland was considering whether it needed to activate Nato article four - meaning member states consult on whether the territorial integrity, political independence or security of any member state is threatened.

Dr Jamie Shea, former deputy assistant secretary general for emerging security challenges at Nato, says the organisation's response to the incident in Poland "is more or less automatic".

"Poland can of course invoke article four and convene a meeting of Nato ambassadors tomorrow morning.

"But even if they didn't - and that's highly unlikely - the Nato Secretary General Jens Stoltenberg, given the gravity of situation, would immediately get the Nato ambassadors together."

He says Nato will be looking to Poland to present all of the facts that it has, which will "hopefully be clearer tomorrow morning in terms of conclusive evidence - that we really are talking about Russian missiles".

"It will be interesting to see what Poland is asking the allies to do - a display of solidarity is automatic and I'm sure that's going to be given."

More now on the details of that phone call between Ukrainian President Zelensky and Polish President Duda.

Zelensky tweets, external: "Expressed condolences over the death of Polish citizens from Russian missile terror.

"We exchanged available information and are clarifying all the facts."

He adds that Ukraine, Poland and "all of Europe and the world must be fully protected from terrorist Russia".

Image source, EPA

We've seen a flurry of diplomacy in recent hours as world leaders react to a blast in south-eastern Poland. While much is still unclear - including what exactly caused it - this is where things stand.

Two dead after Polish blast: Missiles reportedly struck the village of Przewodow, about four miles (6.4km) north of Ukraine, earlier on Tuesday. Two Polish citizens were killed in the explosion, firefighters said. The US and other Western allies are investigating but have not confirmed reports that they were stray Russian missiles.

Russia denies involvement: "No strikes on targets near the Ukrainian-Polish state border were made by Russian means of destruction," its defence ministry said in a statement, adding that the reports were "a deliberate provocation aimed at escalating the situation".

Why it matters: Poland is a member of Nato, a defensive military alliance that has been supporting Ukraine and includes countries such as the UK, Germany and the US. Members agree to help one another if they come under armed attack so, if the missiles are confirmed to be Russian, it could (in theory) risk widening the conflict. But military analysts suggest escalation is unlikely.

We've had a string of tweets from governments around the world, and now British foreign secretary James Cleverly says the UK is "urgently looking into reports of missiles landing in Poland".

The UK is in contact with Poland and other Nato allies, he adds.

Frank Gardner
BBC News, Security Correspondent

Image source, Reuters

When Russian missiles are being fired at targets so close to Poland’s border, and when Ukraine’s air defences are being activated to intercept them, it was perhaps only a matter of time before something like this happened.

The fact that a missile landed on Poland’s side of the border is of course a worrying development, not just for Poland but for all the states on Russia and Ukraine’s western borders.

Moldova has already complained about the effect of Russian missiles fired close to its borders.

But what matters here is what the intended target was, whoever fired the missile. And so far there is no indication that Russia was intentionally targeting anywhere beyond Ukraine’s borders.

The Kremlin knows that such a move would potentially trigger Article 5 of Nato’s constitution, theoretically bringing the entire alliance to Poland’s defence.

That is not a place Nato wants to be in, especially just a day after Russia and America’s spy chiefs have just been meeting to discuss how to avoid unnecessary escalation in this war.

Much of Ukraine’s vital supplies of defensive weaponry passes through Poland. Were that to be deliberately targeted it would be a different matter.

But that does not appear to be the case here.

Image source, Reuters

European Council President Charles Michel says that he will propose a "co-ordination meeting" on Wednesday with EU leaders who are currently attending the G20 summit in Bali.

He tweets , externalthat he has spoken to Polish Prime Minister Mateusz Morawiecki and "assured him of full EU unity and solidarity in support of Poland".

The day's just beginning in Bali, and we're expecting to hear from leaders there in the next few hours.

After his earlier conversation with President Biden, Polish President Duda is now speaking to Ukrainian President Zelensky.

We'll bring you the detail of that call when we have it.