Sometime between 10:50 (when I crossed 31st and Market) and 11:30 (when I returned to the Drexel Campus from a brief visit to 30th Street), Lucy bus 4513 on the Green Loop (I didn't get a look at the block) hit a pedestrian at 32nd (West) and Market Streets. This intersection is in the heart of the Drexel Campus. From what I heard from bystanders, a short female was hit by 4513. 4513 suffered a shattered passenger side windshield. The bus was shut off when I got there. After a few minutes a mechanic started it up and then drove it away following a supervisor. Both SEPTA and Philly police were on the scene along with some Drexel Public Safety officers. Market Street was closed from Lancaster Avenue (the Firestone building) to 33rd Street. There was no news media on the scene. As more information becomes available it will be posted in the forums and here as well.
EDIT: No further information is known at this time (22:05 02/06/2008). There was a person who appeared to have been a member of the Triangle, Drexel's student run newspaper. I will keep an eye out for the next Triangle to see if this made it in there. I have a couple pictures below.