The US is rapidly making plans to evacuate Afghans who worked for the American military ahead of September’s troop pull-out.
Joint Chiefs Chairman Gen Mark Milley said a significant number of interpreters and other employees could be targeted by Taliban militants.
As many as 18,000 Afghan nationals have applied for US visas to immigrate to the US under a special programme.
In April, President Joe Biden said American troops would leave by 11th September, after 20 years of military involvement in Afghanistan.
There are at least 2,500 US troops in the country as part of the 9,600-strong Nato Afghan mission.