Veterans’ groups, Democratic lawmakers, and Afghans called Tuesday for urgent the Biden administration action on a weeklong standoff that has left hundreds of would-be evacuees from Afghanistan desperate to board waiting charter flights out of the Taliban-ruled country.

They say several dozen Americans, along with a much larger number of U.S. green card holders and family members, are among vulnerable Afghans waiting to board pre-arranged charter flights at the airport in the northern Afghan city of Mazar-e-Sharif that are being prevented from leaving.

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“We think we are in some kind of jail,” said one Afghan woman among the would-be evacuees gathered in Mazar-e-Sharif. She said elderly American citizens and parents of Afghan-Americans in the U.S. are among those being blocked from boarding evacuation planes.

The woman, an employee of a U.S.-based nonprofit, Ascend, that works with Afghan women and girls, spoke Tuesday on condition of anonymity for her security. She said those in her group have proper passports and visas, but that the Taliban currently are blocking them from entering the airport.

She said she has been waiting for eight days. At one point last week, alarm spread through the women’s side of her hotel in the city when warnings came that the Taliban were searching the would-be evacuees on the men’s side, and had taken some away.

“I am scared if they split us and not let us leave,” she said. “If we can’t get out of here, something wrong will happen. And I am afraid of that.”

Secretary of State Antony Blinken said Tuesday the U.S. was working with the Taliban to resolve the matter. He rejected an assertion from a Republican lawmaker, Rep. Michael McCaul of Texas, over the weekend that the standoff at Mazar-e-Sharif was turning into a “hostage situation” for American citizens in the group.

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“We’ve been assured all American citizens and Afghan citizens with valid travel documents will be allowed to leave,” Blinken said in Doha, Qatar, a major transit point for last month’s frantic U.S. military-led evacuations from Afghanistan.

Later Tuesday, 12 Democratic lawmakers added to the pressure for evacuees, in a letter urging the administration to disclose its plans for getting out all of the hundreds of at-risk people remaining in Afghanistan, including American citizens.

“Our staff have been working around the clock responding to urgent pleas from constituents whose families and colleagues are seeking to flee Afghanistan, and they urgently require timely, post-withdrawal guidance to best assist those in need,” Reps. Jerrold Nadler, Zoe Lofgren, Gerald Connolly and nine other lawmakers from President Joe Biden‘s party wrote.

Blinken, in Doha, said the Taliban had told U.S. officials that the problem in Mazar-e-Sharif was that passengers with valid travel documents were mixed in with those without the right travel papers. “We have to work through the different requirements, and that’s exactly what we’re doing,” Blinken added.

Taliban leaders, who named a new Cabinet Tuesday in the wake of their lightning takeover of most of the country last month, also say publicly that they will allow people with proper documents to leave the country. Taliban officials insist they are currently going through the manifests, and passenger documents, for the charter flights at Mazar-e-Sharif.

A U.S.-led evacuation out of the airport in the capital, Kabul, flew out tens of thousands of Afghans, Americans and others last month before ending Aug. 30, with the withdrawal of the last U.S. troops and diplomats.

The Biden administration says the current holdup is the fault of the Taliban, but some private organizers of the flights are skeptical. They say the State Department and other U.S. agencies have been slow or outright unresponsive to pleas for help despite assurances that Washington would work with the Taliban and others to get people out.

On Monday, the State Department said it had helped a family of four U.S. citizens escape Afghanistan via a land route.

An array of American men and women and groups — many of them with some past experience in Afghanistan, or other ties — have been working for weeks to try to help evacuate at-risk Afghans. Much of that effort is focused now on the planes in Mazar-e-Sharif.

Some of those Americans pushing for U..S. action said Tuesday they fear the Biden administration will help out American citizens, and leave behind green card holders, Afghans who used to work with Americans, and others vulnerable for their work, including journalists, women’s advocates and rights workers.

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Last month’s U.S.-led flights weren’t limited to citizens and green card holders, said Marina LeGree, the American head of Ascend, the nonprofit for Afghan women. “The game changed partway through,” she said.

Blinken, in Doha, said the U.S. has been in contact with the Taliban “in recent hours” to work out arrangements on charter evacuation flights.

Alex Plitsas, a representative of a group called “Digital Dunkirk,” which is serving as an umbrella group for several organizations arranging the private evacuation efforts since the completion of the U.S. military withdrawal from Afghanistan, welcomed Blinken’s words.

“Welcome news,” Plitsas said. “We are in touch with the State Department through official channels to help facilitate whatever is needed for those individuals that we have been helping who remain stranded.

“Our men and women in uniform and diplomats on the ground in Kabul did a fantastic job. Now it’s time to bring the last remaining folks home.”