New York was shook by a bombing on Times square, probably targetted at a recuitment office for one of the branches of the military.
I've said this before and I'll say this again: the internet is riddeled with infomation on producing explosives, some of which is accurate.
It is impossible to eliminate every single way for people to harm one another, it is vital that we try to instill some kindness into humanity. It is not so much "how" someone wreaks havoc, much more "why". School shooters don't commit their atrocities "because they can", they are ill, filled with hate or just trying to go down in a blaze of glory.
It's those first two that are the greatest threat, because they will go to any ends to do their damage.
Or for Awalk: I've long realized that removing guns from society (or just NYC) will make society safe.