Although most of its allies had finished their evacuation flights, the U.S. planned to keep its round-the-clock flights going until the deadline, saying 113,500 people had been evacuated since Aug. 14, the day before the Taliban claimed Kabul. Biden warned Saturday that commanders had told him another attack was “highly likely in the next 24-36 hours,” and the U.S. Embassy issued a new warning early Sunday for all Americans to avoid the airport area entirely.

Britain ended its evacuation flights Saturday, though Prime Minister Boris Johnson promised to “shift heaven and earth” to get more of those at risk from the Taliban to Britain by other means.

Britain’s ambassador to Afghanistan, Laurie Bristow, said in a video from Kabul airport and posted on Twitter that it was “time to close this phase of the operation now.”

“But we haven’t forgotten the people who still need to leave,” he said. “We’ll continue to do everything we can to help them. Nor have we forgotten the brave, decent people of Afghanistan. They deserve to live in peace and security.”