I rarely pray. (Mostly, because I'm a fairly strong agnostic, and I feel very strange addressing a Force I don't really believe in.) But I'm going to try to summon up the purity of spirit to pray for the families and friends and neighbors of the terrorists who planned this. More innocent people are going to die before this chapter in history is over, and that horrifies me most of all.
I don't think I'm strong enough to pray for those who weren't innocent, though.