Regarding the politics, one thing I learned was, via google search, is why any group claims responsibility for such an attack. Kind of obvious, but wasn't sure till I read it. The way to advertise your terror organization is to claim responsibility of such attacks, helps with further recruiting. Which then leads to follow up question of how would one substantiate such claims? This is where (secret) intelligence comes into play, tracking of known code words and such. Still, as long as that is (intentionally) kept secret, seems like the masses are asked to just have faith in who did what, and even why.
Regarding the spiritual, when I first heard of attacks (around 3:30 a.m. CST-US), and for about the next hour, I certainly was entertaining notions of revenge against attackers, those that support this form of attack. But realize that is perpetuating the problem. The idea that a good defense is an attacking offense is seemingly rooted in our collective forms of justice. IMO, you can be entirely without any religious belief and still justify revenge as a proper reaction to any attack, especially atrocities / attacks involving deaths. It's challenging to escape from that mindset. But there is an escape, and it is rooted in forgiveness. If forgiveness is for you some notion of bestowing a judgment (of release from guilt) upon another, then that's fine. I think it is the normal concept of forgiveness. But, not how I think of forgiveness foremost. Instead, I see it as forgiving own self from insisting that this is the way the world (or rather my world) has to operate. That revenge is the most logical response. Even in thought, much (much) less in action. There is strength in being vigilant for (the) peace (of God). Not wanting to be over zealous here. Just noting how I found escape from my own thoughts of revenge. Might revert later on to thoughts of revenge based on such attacks, as I think at times they are atrocities worthy of my emotional investment. But also just a reminder to stay vigilant for peace. May come across as 'doing nothing' but sometimes doing nothing is better than doing something that perpetuates the problem.