The warning comes amid continued chaos outside the airport, with reports of a deadly crush.
In a briefing on Saturday, the US Department of Defense said 17,000 people have been flown out of the airport, including some 2,500 US citizens.
However, the Pentagon gave no further details about why it had issued the warning about the airport, saying it was simply a "prudent notification".Germany's government issued a statement saying the airport remains "extremely dangerous and access to the airport is often not possible", whilethe security situation had "deteriorated significantly in the last few hours" and postponed a chartered evacuation flight from Kabul.
But the US has set a withdrawal date of 31 August for their troops, and it is unclear what will happen after this date.
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