The State Department refused to grant official approval for private evacuation flights from Afghanistan to land in third countries, even though the department conceded that official authorization would likely be needed for planes to land in those nations, an email reviewed by Fox News shows.

Furthermore, the State Department explicitly stated that charter flights, even those containing American citizens, would not be allowed to land at Defense Department (DOD) airbases. U.S. officials have pointed to possible security threats from landing charter planes at military bases, saying that they lack the resources on the ground to fully verify flight manifests…

A Sept. 1 email that a State Department official sent to Montalvo underscores the extent to which private evacuation efforts have run into bureaucratic roadblocks.

“No independent charters are allowed to land at [Al Udeid Air Base], the military airbase you mentioned in your communication with Samantha Power. In fact, no charters are allowed to land at an [sic] DoD base and most if not all countries in the Middle Eastern region, with the exception of perhaps Saudi Arabia will allow charters to land,” the official wrote.

“You need to find another destination country, and it can’t be the U.S. either.”