Two British nationals, and the child of another national, were killed in the Islamic State's attack at Kabul airport, and two others were also injured, according to the foreign secretary Dominic Raab.

"These were innocent people and it is a tragedy that as they sought to bring their loved ones to safety in the UK they were murdered by cowardly terrorists," Raab said.

Following Thursday's attack, prime minister Boris Johnson had said that, despite what he called "a barbaric act," evacuations from Afghanistan would continue.

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But the UK is now wrapping up its evacuations at Kabul airport. And according to the defense minister Ben Wallace, the last flights out for British nationals and Afghan allies and their families will be over by the end of the day.

The remaining troops will leave over the weekend.

"For now, we are going to get our last thousand out, people on the inside of the airfield that we've brought across to Baron Hotel," he said. The hotel was reportedly the scene of one of two blasts that killed at least 85 people, although U.S. security officials now believe there was only one bomb that was detonated at the Abbey gate of Kabul International Airport.

"We will process them, bring them out and if possible if we identify people outside still that we can find a way of getting in," said Wallace. "Then we will see what we can do, but the main process, the main effort is over."

Afghan refugees who have managed to get out are starting to arrive in the UK. The government says it has evacuated 13,000 people so far. They are among more than 100,000 civilians flown out since the Taliban took over Kabul.

But not everyone eligible to leave has managed to get out, with around 1,000 Afghans and up to 150 British nationals left in Afghanistan, according to the ministry of defense.

In the rush to leave the embassy when the Taliban took over Kabul, documents with addresses and contact details for several Afghans who had been employed at the Embassy had not been shredded but were left lying around. 

The foreign office says that it has rescued three of the families identified on the documents.

The UK government is now encouraging those left behind to find a safe exit by other means, such as crossing into Pakistan. The UK hopes to process the remaining applications at the British Embassy there. 

It's not clear how the Taliban will react to people trying to cross the border, or how many refugees Pakistan is prepared to let in.