Joe Biden has warned those behind the attacks at Kabul’s airport on Thursday: “We will not forgive, we will not forget, we will hunt you down and make you pay.”
Some 143 people, including 15 US personnel, were injured in the attack.
Mr Biden said the Americans who were killed in attacks were “heroes” who were “engaged in a dangerous, selfless mission to save the lives of others”.
The UK’s Ministry of Defence has confirmed there were no fatalities among British military personnel or government workers.
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Speaking from the White House on Thursday evening, Mr Biden said he had asked for plans to strike back at Isis-K, the Islamic State affiliate believed to have been responsible for the attacks.
He said the US would “find ways of our choosing without large military operations to get them wherever they are”.
More on Afghanistan
Mr Biden also said the US effort to evacuate Americans and the Afghans who helped them will continue, with more troops being sent in if necessary.
He added: “Whatever they need, if they need additional force, I will grant it.”
Analysis by Mark Stone, Sky News US correspondent
A deeply emotional statement from the American president.
He displayed the empathy he has been known for. He drew on his own experiences – a son who served on combat missions; the loss of his own children.
“We have some sense of the feeling…” he said, adding that the loss is like being “sucked into a black hole with no way out.”
But he also attempted to demonstrate power, strength and steadfastness.
“We will not forgive. We will not forget. We will hunt you down and make you pay.” he said of the ISIS-K terrorists.
“We must complete this mission and we will. We will not be deterred by terrorists. We will continue the evacuation.”
He revealed that he believed he knows where ISIS-K terrorists are located and he says he will give commanders on the ground whatever they need.
The attacks have increased the pressure on Mr Biden, who had justified the withdrawal as a means of preventing American deaths in what he described as Afghanistan’s civil war.
On 20 August, after the Taliban took Kabul, Mr Biden told reporters that remaining in Afghanistan any longer could mean he would need to “send your sons, your daughters – like my son was sent to Iraq – to maybe die. And for what? For what?”
But instead of preventing bloodshed, the chaotic evacuation has now resulted in the first US deaths in action in Afghanistan in 18 months.
On Thursday evening, Mr Biden stood by his decision to withdraw from Afghanistan, saying: “It was time to end this 20-year war.”
Some European leaders had called for the date to be moved back further but the Taliban warned earlier in the week that such a move would be seen by them as crossing “a red line” and would “provoke a reaction”.
The unprecedented Russian drone attacks on Poland are both a test and a warning. How Europe and NATO respond could be crucial to security on this continent.
The Russians are past masters at what’s called “salami slicing”. Tactics that use a series of smaller actions to produce a much bigger outcome that otherwise would have been far more provocative.
Image: Vladimir Putin has a history of testing the West. Pic: Sputnik/Alexei Druzhinin/Kremlin via Reuters
Putin is good at this.
He used salami slicing tactics masterfully in 2014 with his “little green men” invasion of Crimea, a range of ambiguous military and diplomatic tactics to take control. The West’s confused delay in responding sealed Crimea’s fate.
He has just taken a larger slice of salami with his drone attacks on Poland.
Image: A drone found in a field in Mniszkow, eastern Poland
They are of course a test of NATO’s readiness to deploy its Article 5 obligations. Russia has attacked a member state, allies believe deliberately.
Will NATO trigger the all for one, one for all mechanism in Poland’s defence and attack Russia? Not very likely.
But failing to respond projects weakness. Putin will see the results of his test and plot the next one.
Expect lots of talk of sanctions but remember they failed to avert this invasion and have failed to persuade Russia to reverse it. The only sanctions likely to bite are the ones the US president refuses to approve, on Russia’s oil trade.
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6:16
Russia’s Poland incursion represents ‘new chapter’ in Ukraine war, expert says
So how are the drones also a warning? Well, they pose a question.
Vladimir Putin is asking the West if it really wants to become more involved in this conflict with its own forces. Europeans are considering putting boots on the ground inside Ukraine after any potential ceasefire.
If this latest attack is awkward and complicated and hard to respond to now, what happens if Russia uses hybrid tactics then?
Deniable, ambiguous methods that the Russians excel in could make life very difficult for the alliance if it is embroiled in Ukraine.
Think twice before committing your troops there, Russia is warning the West.
Riot police have clashed with protesters in Paris after they took to the streets in response to calls to ‘Block Everything’ over discontent with the French government.
Tens of thousands of people have taken to the streets of the French capital and other cities, including Marseille and Montpellier, in response to the online ‘Bloquons Tout’ campaign, which is urging people to strike, block roads, and other public services.
The government has deployed more than 80,000 officers to respond to the unrest, which has seen 200 arrested nationwide so far, according to police, and comes on the same day the new prime minister is being sworn in.
Demonstrators were seen rolling bins into the middle of roads to stop cars, while police rushed to remove the makeshift blockades as quickly as possible.
Tear gas was used by police outside Paris‘s Gare du Nord train station, where around 1,000 gathered, clutching signs declaring Wednesday a public holiday.
Others in the city blocked the entrance to a high school where firefighters were forced to remove burnt objects from a barricade.
Image: Riot police with shields face off with protesters in Paris. Pic: Reuters
Image: Protesters block the streets in Paris on Wednesday. Pic: AP
Image: “Block Everything” blockade a street in Paris. Pic: Reuters
Image: A protester raises a red flare outside Paris’s Gare du Nord train station. Pic: Reuters
Elsewhere in the country, traffic disruptions were reported on major roads in Marseille, Montpellier, Nantes, and Lyon.
Interior Minister Bruno Retailleau told reporters a group of protesters had torched a bus in the Breton city of Rennes.
Image: Protesters fill the streets and block tram lines in Montpellier, southern France. Pic: Reuters
Image: A protester in Montpellier waves a lit flare. Pic: Reuters
Image: Protesters hold a sign that reads: ’10 September public holiday!!’ in Paris. Pic: Reuters
Fourth prime minister in a year
The ‘Block Everything’ rallies come amid spiralling national debt and are similar to the Yellow Vest movement that broke out over tax increases during President Emmanuel Macron’s first term.
‘Bloquons tout’ was first spearheaded online by right-wing groups in May but has since been embraced by the left and far left, experts say.
Image: French outgoing Prime Minister Francois Bayrou (left) with his replacement Sebastien Lecornu at Paris’s Hotel Matignon. Pic: Reuters
Image: Crowds of protesters outside Gare du Nord in Paris. Pic: Reuters
Image: ‘Block Everything’ protesters outside Paris’s Gare du Nord on Wednesday. Pic: Reuters
A teacher, Christophe Lalande, taking part in the Paris protests, told reporters at the scene: “Bayrou was ousted, [now] his policies must be eliminated.”
Elsewhere, union member Amar Lagha said: “This day is a message to all the workers of this country: that there is no resignation, the fight continues, and a message to this government that we won’t back down, and if we have to die, we’ll die standing.”
Image: An explosion caused by an Israeli airstrike in Doha, Qatar. Pic: AP
It’s also shattered the critical sense of trust needed in these fragile ceasefire talks.
Qatar has played a critical role as an intermediary between Israel and Hamas for the last two years and those diplomatic efforts have been blown apart by this unprecedented attack.
Qatar has reacted with absolute fury and it has shocked and angered other Gulf neighbours, who, like Qatar, stake their reputation on being hubs of regional peace and stability.
Donald Trump is clearly unhappy, too. A strike on Qatar – a key American ally and home to Al Udeid Air Base, the largest US military hub in the Middle East – is seen as a dangerous escalation.
There’s no suggestion that permission was sought by Israel from its own closest ally in Washington.
And there’s little clarity if they were even forewarned by the IDF, as the White House said it learned of the attack from its own military.
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0:32
Aftermath of IDF strike on Hamas in heart of Doha
Donald Trump’s envoy to the Middle East, Steve Witkoff, was then tasked with alerting Qatar immediately, but by this point, it was too late.
According to Qatar’s foreign ministry, that call came 10 minutes after the first explosion was heard in Doha.
It’s clear Israel has crossed a huge diplomatic red line here.
Qatar plays a pivotal role on the international stage, punching well above its diplomatic weight for a country of its size.
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What was Israel thinking, carrying out this attack? And was it worth it?
They claim it was a “precise strike”, but none of the Hamas leadership were taken out as they claimed was their objective.
Five lower-ranking officials were killed along with a member of Qatar’s security forces. What it has done is left any hope of ceasefire talks in tatters.
For many, this was a huge miscalculation by Benjamin Netanyahu.