On a serious note...Here is a picture of the school's athletic field ...look at ALL the trees surrounding the area...easy shooting hiding grounds...easy to find on the internet...the PERP is planning all shootings from the internet...
The Mapquest Killer? Boy, are they gonna love the publicity. :^/
With regard to the trees... there is an added benefit to the shooter in using parks to position his shots: when fired near a stand of trees, a rifle bullet's supersonic crack tends to "follow the treeline".