WASHINGTON (AP) — The first flight evacuating Afghans who worked alongside Americans in Afghanistan brought more than 200 people, including scores of children and babies in arms, to new lives in the United States on Friday, and President Joe Biden said he was proud to welcome them home.

The launch of the evacuation flights, bringing out former interpreters and others who fear retaliation from Afghanistan’s Taliban for having worked with American troops and civilians, highlights American uncertainty about how Afghanistan’s government and military will fare after the last U.S. combat forces leave that country in the coming weeks.

Family members are accompanying the interpreters, translators and others on the flights out. The first evacuation flight, an airliner, carried 221 Afghans under the special visa program, including 57 children and 15 infants, according to an internal U.S. government document obtained by The Associated Press.

It touched down in Dulles, Virginia, just outside Washington, D.C., after midnight, according to the FlightAware tracking service.

Friday’s flight was “an important milestone as we continue to fulfill our promise to the thousands of Afghan nationals who served shoulder-to-shoulder with American troops and diplomats over the last 20 years in Afghanistan,” Biden said. He said he wanted to honor the military veterans, diplomats and others in the U.S. who have advocated for the Afghans.

“Most of all,” Biden said in a statement, “I want to thank these brave Afghans for standing with the United States, and today, I am proud to say to them: ‘Welcome home.’”

Secretary of State Antony Blinken and Secretary of Defense Lloyd Austin lauded the Afghans for their work alongside Americans and said their arrival demonstrates the U.S. government’s commitment to them.

Friday’s flight was all about “keeping promises,” said Will Fischer, an Iraq war veteran and an advocate on veteran’s issues.

But a refugee agency said the Biden administration appeared to be still scrambling to work out the resettlement of thousands more of the Afghans, and it urged Biden to bring them quickly to the U.S. or a U.S. territory, such as Guam.

“To date, there is simply no clear plan as to how the vast majority of our allies will be brought to safety,” Krish O’Mara Vignarajah, president of the Lutheran Immigration and Refugee Service resettlement agency, said of the Afghan interpreters.

“We cannot in good conscience put them at risk in third countries with unreliable human rights records, or where the Taliban may be able to reach them,” the resettlement official said.

The Biden administration calls the effort Operation Allies Refuge. The operation has broad backing from Republican and Democratic lawmakers and from veterans groups. Supporters cite repeated instances of Taliban forces targeting Afghans who worked with Americans or with the Afghan government.

Congress on Thursday overwhelmingly approved legislation that would allow an additional 8,000 visas and $500 million in funding for the Afghan visa program.

The United States has been talking with Qatar and Kuwait about temporarily hosting thousands of other Afghan interpreters who are much further behind in their visa application process than Friday’s arrivals.

But U.S. officials, speaking on the condition of anonymity to discuss negotiations, said Friday that no deal had been closed with those two countries. Concerns about housing Afghans who have not completed their security screenings and uncertainty on the American side about finding funding for the massive relocation effort have remained obstacles, the U.S. officials said.

Biden announced earlier this year the U.S. would withdraw all its troops from Afghanistan by Sept. 11, honoring a withdrawal agreement struck by former President Donald Trump. He later said the U.S. military operation would end on Aug. 31, calling it “overdue.” Some administration officials have expressed surprise at the extent and speed of Taliban gains of territory in the countryside since then.

Biden said that although U.S. troops are leaving Afghanistan, the U.S. will keep supporting Afghanistan through security assistance to Afghan forces and humanitarian and development aid to the Afghan people.

The newly arrived Afghan people will join 70,000 others who have resettled in the United States since 2008 under the special visa program.

Subsequent flights are due to bring more of the roughly 700 applicants who are furthest along in the process of getting visas, having already won approval and cleared security screening.

The first arrivals were screened for the coronavirus and received vaccines if they wanted them, said Tracey Jacobson, the U.S. diplomat running the effort. They were expected to stay at at a hotel on a base in Fort Lee, Virginia, for about seven days, completing medical exams and other final steps, Jacobson said. Resettlement organizations will help them as they travel to communities around the United States, with some bound for family members already here, she said.

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