The US claims it has wiped out a vehicle carrying several would-be suicide bombers heading for an attack at Kabul's airport.
The Afghan capital was rocked by a huge blast, with officials claiming there was a “significant secondary explosions” - suggesting there a lot of explosives on the vehicle.
The officials, speaking on condition of anonymity, said the strike targeted suspected ISIS-K militants.
A Pentagon source told CNN: “We are confident we successfully hit the target.”
Witnesses reported an explosion near Kabul airport and television footage showed black smoke rising into the sky. There was no immediate word on casualties.
Two witnesses said the blast appeared to have been caused by a rocket that struck a house in an area to the northern side of the airport, but there was no immediate confirmation.
The explosion comes just hours after the last UK flight left the country following the take over from the Taliban.
Ambassador to Afghanistan Sir Laurie Bristow, who had been processing those fleeing the country at the airport until the last moment, was among those who landed at RAF Brize Norton base in Oxfordshire on Sunday morning.
And it brought to a close Operation Pitting, believed to be the largest evacuation mission since the Second World War.
In a video uploaded to Twitter on Sunday morning, Mr Johnson praised the more than 1,000 military personnel, diplomats and officials who took part in the operation in Afghanistan.
He said: "UK troops and officials have worked around the clock to a remorseless deadline in harrowing conditions.
"They have expended all the patience and care and thought they possess to help people in fear for their lives.
"They've seen at first-hand barbaric terrorist attacks on the queues of people they were trying to comfort, as well as on our American friends.
"They didn't flinch. They kept calm. They got on with the job.
"It's thanks to their colossal exertions that this country has now processed, checked, vetted and airlifted more than 15,000 people to safety in less than two weeks."
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