I wonder who did it?

What kind of sick person explodes a nail bomb outside of a school?  Right now, we don’t know, but police in Liverpool are looking for the man who did it.  Fortunately, no one was hurt, but it’s so easy to think of the damage that could have been inflicted.  Since this was a fairly small bomb, the goal seemed to be, not to kill the children at this Christian school, but to maim them horribly.