The Mountain Home Air Force Base in Idaho was locked down Sunday following a midair collision during a local air show that sent two fighter jets crashing to the ground. The base, home to the U.S. Air Force's 366th Fighter Wing, known as the "Gunfighters," announced the lockdown at 12:30 p.m. local time. Video circulating on social media showed two fighter jets colliding midair before spinning toward the ground in a fiery crash amid black plumes of smoke. Four parachutes were visible deploying near the crash site.