They don’t know, they are just making assumptions that people got killed in Gaza. Even location is just bombed houses, of which there are plenty in the region and doesn’t necessarily mean it’s Gaza. And you get down-voted for simply doubting because that’s what people here do, hate on Israel and grasping at straws. Meanwhile, no one asked why were they being filmed. How did the person filming know that bombs will fall on those 4 guys in 5 or so minutes. Why did that one guy keep walking in the same direction and not try to save his life by running somewhere and hiding. I personally find all those things suspicious. But that sort of thinking doesn’t fit into idea that Israel is having fun killing people. So you, and now me, will get down voted.