Absolutely chilling. When I heard this morning they were closing the schools because of parents' concerns, I bought it hook, line, and sinker. Your post (and three cups of coffee) have certainly opened my eyes to the possiblity of a threat to our school children. I pray this nightmare is soon over.
When the 13 year old boy was shot it did remind me that one of the communications, allegedly from OBL or one of his associates, claimed that our schools would be attacked. However, it did not state if we are talking about colleges, high schools, or grade schools. There was a thread posted last night, http://www.freerepublic.com/focus/news/772801/posts, about a shooting at a college in Australia yesterday but I was unable to find it on the AP site.
In addition, look at all the chaos shutting the schools down causes for single parents or in homes where both parents work. (And this is almost all families now.) It's just something they wouldn't do without a very good reason.
My concern is that they may just move the attack--whatever it is-- to a different area--children all over the two states may be at risk now.