Two U.S. Navy jets collided during an air show at Mountain Home Air Force Base in Idaho on Sunday, prompting an emergency response and a temporary base lockdown.

Axar.az reports, citing AP, all four crew members aboard the aircraft successfully ejected and landed safely after the mid-air collision, which occurred during the “Gunfighter Skies” air show about 50 miles (80 km) south of Boise.

Emergency services responded immediately, and an investigation has been launched.

Base officials confirmed the incident and said responders were on the scene, while further details about the cause of the crash have not yet been released.