Mountain Home Air Force Base outside of Boise, Idaho, was locked down Sunday afternoon following a crash at an air show.

“An aircraft incident has occurred at Mountain Home Air Force Base during the Gunfighter Skies Air Show two miles northwest of the base,” base officials posted online Sunday, adding that emergency responders were on the scene and an investigation was underway.

ABC affiliate station KIVI in Boise reported that two jets participating in the air show may have collided in flight.

The status of the personnel onboard the aircraft is unknown.

The air show has been cancelled, according to a post from the Mountain Home Police Department, which further advised spectators not to travel to the Air Force base.

This is a developing story. Please check back for updates.