A civilian driver was shot and killed by security forces at Davis-Monthan Air Force Base in Tucson after failing to stop at the main gate and driving erratically.

A chilling code crackled over secure channels, forcing Air Force One into evasive maneuvers as an unidentified aircraft closed in on its path.

A person driving a vehicle was shot and killed after illegally entering the main gate at the Davis-Monthan Air Force Base in Tucson, military officials said.