I had to run an errand and drove past my 1st grader's school on the way home. I saw a ambulance with lights and siren leaving his school. I totally panicked until I got home and checked my answering machine to make sure school wasn't trying to call me.
The same thing happened a few years ago when I drove past his daycare. The daycare was smaller, so I pulled in the parking lot and called after the ambulance left...just to make sure it wasn't my kid.
I hope that it's not anything too serious and just them being cautious.