(12-19-12) Since the children really are missing, and few (if any) died in what is obviously a wag the dog, It is extremely likely that the children were stolen and sold on the slave market. They had to go somewhere, and the people who most likely perpetrated this wag run the biggest slave trade center in the world. It just fits. If you are not aware of the sex slave trade and that little tribe, you should get informed on that topic.
This is my best guess at why a separate "Sheriff" was sent to guard every single parent of every child afterwards. The Sheriffs are not likely to be real sheriffs, they are more likely paid goon actors, and with such child slaves selling for well over $200,000 a pop, it's worth it to pay people to pose as sheriffs to give the first alert about any suspicions from parents. IT JUST FITS. IF THE SHOOTER IS DEAD, WHY ARE THE "SHERIFFS" NEEDED to guard every set of parents? How could they spare THAT MANY SHERIFFS, 20 sets of parents x 8 hour shift = 60 sheriffs needed.