The U.S. Embassy ordered everyone to leave the Kabul airport immediately because of a 'specific, credible' threat just hours after President Joe Biden said another attack on the airport was imminent. 

But urgency was ramped up by the Embassy's Saturday night warning, which didn't delve into details about who is behind the threat.  

'Due to a specific, credible threat, all U.S. citizens in the vicinity of Kabul airport (HKIA), including the South (Airport Circle) gate, the new Ministry of the Interior and the gate near the Panjshir Petrol station on the northwest side of the airport, should leave the airport area immediately.'