Probably terrorism.

2007 bombings and stuff were prominent due to Palestine. Obviously they didn't say it was about Palestine, but the whole "Letter to America" from Osama Bin Laden set a mandate to all the Al Qaeda.

And after two years of slaughtering kids, there's little to no chance that this isn't related.

The "Russia" threat is completely nonsense because nukes. So either domestic terrorism or something like that.

Either way not good.