E-mail from the UM Office of Public Safety, quoted in its entirety:
The UM Police Department had planned to support this weeks environmental initiatives with a “green day” on Wednesday, April 18th; UM patrol officers were logistically set to use only “green,” non-fossil fuel burning modes of transportation such as Segways, bicycles and GEMs (electric golf carts). However, due to increased security measures stemming from the recent events at Virginia Tech, the UM Police Department will be postponing this event.
(Despite this setback, the Green initiative seems real. I've noticed cops on Segways running around in the past week. Segways seem just the right size for campus walkways, although it seems I missed my chance to try one.)
As for fear, it could be worse: we're not locking down the campus in fear of an umbrella.