Israel/Palestine

The vid mentions an ammunitions warehouse - then also secondary explosions. Where exactly was the ammo warehouse (in relation to the 'camp')? And was this the intended target? A secondary?

And 2) if the intended strike was as precise, and at a distance from the 'camp' claimed - why was Netanyahu almost immediately calling it a 'mistake' and issuing apology in the aftermath?. Clearly lending itself toward a conclusion - somebody F'd up somewhere ...