Drone Strikes Onstage During Bone Thugs-N-Harmony Performance

Bone Thugs-N-Harmony hit the westSIDE, and the westside hit back ... with a drone to the dome of one of the group's members.

BTH was performing in San Bernardino at the High Life Music Fest Sunday night when the flying object buzzed the stage. Watch, fans online think it was Flesh-n-Bone who took the hit.

It's unclear if the group or a fan launched it, but the drone went down. Flesh kept on rapping.