Teen was electrocuted on the roof of a classroom trailer

...“It is my understanding that there is a shed on the back of the building that you can climb up and get access to the roof of the school from,” Torre said. “Apparently there are some wires along the roofline that may have been what was involved here.” 

According to a Fox Mills Estates resident who lives adjacent to the school and wished to remain anonymous, neighborhood teens often climb up on the roof of the school to “hang out.” 

Fox Mill Elementary School Assistant Principal Brian Moose acknowledged that there is a shed behind the school with wires and conduits that can be accessed. “You could climb it pretty easily,” he said...

 http://www.fairfaxtimes.com/article/20130619/NEWS/130619057/1117/teen-electrocuted-on-roof-next-to-fox-mill-elementary-school&template=fairfaxTimes