if it had a tail fuze and partially detonated. some mk-82's have been around for 20 years, although the u.s. has up most if not all of those since '91. but if it was u.s. made, and israel had it for awhile...never know? and if it broke in half without detonating, depending on what it hit and at what angle, the pieces could easily have been catapulted as a result.
Saudi FM: We hope Iran uses sanction relief for development, not nefarious activities (Reuters)
from the article: Report: UN evidence counters Israel's account of Gaza war