This terror operation was set up as a military op. They had their assault personel, support vehicles, outer security for cover support during retreat and field observers as listening posts to report movement as well as undercover operatives.
Terrorists always repeat themselves with any act that doesn't end in total failure;
Before falling asleep last night, I thought, those kids without their families, parents, probably crying, who could do this, heck these terrorists are child molestors.