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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."
The US President was speaking after it emerged that 12 US service personnel were among the 72 people killed after two blasts and a gunfight outside Kabul's airport.
Some 143 people, including 15 US personnel, were injured in the attack, which Islamic State said it carried out.
The UK's Ministry of Defence has confirmed there were no fatalities among British military personnel or government workers.
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.
The deadline for withdrawal agreed between the Taliban and Donald Trump during his presidency last year had been May, but Mr Biden pushed this back to the end of August.
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".