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A Washington Post article on the same subject. It would be worth waiting a bit until more objective evidence comes out. As yet, a lot of this is hearsay. If in fact a large massacre has taken place, excavation and repairs will reveal it. It goes without saying that a lot of suffering happened here, and noncombatants were killed, but there is as yet no evidence of a massacre (hundreds of noncombatants deliberately killed).
The camp was thoroughly boobytrapped, which was one reason bulldozer demolition replaced door-to-door searches.