Bicycle detail

My bike was locked to the bike rack in the courtyard at Northwestern University between Searle building and Kellogg Weiboldt Hall. I walked up as the thieves were pulling my bike away from the rack. I yelled and ran after them, but the thief was able to get away and ride my bike Westbound on Superior Street. There appeared to be four of them - two lookouts and two working on my bike. The Starbucks manager actually saw the thief riding my bike away and knew him - he goes by "Black" and hangs out around Hudson and Chicago Avenue. That courtyard is very busy all the time, and I parked my bike in front of an office window. They had cut my lock and somehow flexed it to slip the bike and cable out.