Ninja School?

Apparently, a school in New Jersey was locked down after a ninja was spotted in the woods outside the school.  I thought it was enough that us future parents have to worry about guns at school (especially now that the Supreme Court says everyone can carry guns), now we have to worry about ninjas.  What is this world coming to?  http://www.phillyburbs.com/pb-dyn/news/104-06252008-1554393.html