This was a serious and horrific massacre where videos were carried on Facebook for some time and, as you said, it's hate speech in clear breach of your policies. The alleged bomber himself, in fact, had a Facebook account, which I'm sure you know. I'm surprised that you didn't check, because that's something that I would have thought Facebook would want to know.
They would have wanted to know how it is that, with videos having been spread on Facebook, this was something that Facebook had missed, if at all you had missed it. I'm surprised you are not aware today as to whether or not this was something flagged to Facebook. Can you confirm that?