WASHINGTON: US Representative Mike Waltz has called on the State Department to work with non-governmental organizations that he said are trying to clear charter flights to evacuate Americans and at-risk allies still hiding in several Afghan cities.

In a letter to Secretary of State Antony Blinken on Saturday, the Republican lawmaker and former White House official said he had been told by several NGOs that there were manifested charter flights "available, funded, and ready to fly" people out.

Groups of American citizens, legal permanent residents, and Afghans eligible for special visas were hiding near airports waiting for clearance to depart the country, Waltz, a decorated veteran, said.

Roughly 124,000 people were evacuated last month from Kabul in a massive U.S.-led airlift of US and other foreign citizens as well as vulnerable Afghans as the Taliban took control there.

The West's adversary in the two-decade war that followed the Sept. 11, 2001, attacks on the United States, the Taliban have promised safe passage for those wanting to leave.

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Waltz did not specify how many charter flights were awaiting a clearance to depart from the Taliban, and no further comment was immediately available from his office.

He said the non-governmental organizations were willing to share their passenger manifests to allow the US government to conduct "appropriate vetting and prioritization."

"These groups are communicating to my office that State is not proactively arranging the appropriate clearances to take full advantage of these flights," he wrote.

The State Department had no immediate comment on Waltz's letter. Spokesman Ned Price told reporters on Thursday that the department was advising private groups organizing such charters on a case-by-case basis, but underscored the risks.

He denied the State Department was preventing charters from leaving Afghanistan, and said US officials continued to try to facilitate landings in third countries.

However, he said, the issue was complicated by the lack of US personnel on the ground and its lack of control of the airspace over Afghanistan or elsewhere in the region.