We put on a run every year for Autism ( runforautism.com ) and we give our thoughts and prayers to all the fine folks there.
Any act like this is a cowardly act of terrorism, this reminds us again that there is evil in the world and that we need to pay attention to our surroundings to do our part in combating it. If something doesn't seem right, follow your instincts, it probably isn't. Being prepared and vigilant and being paranoid is a fine line at times.