It's the block of East Madison Street just east of 23rd. Lots of Police cars but no drug dealers: it's a downed power pole, hit by a truck, that's causing all the action on Madison. The P-I initially said a car did it, and there's a crushed little car on the street, but it's hard to believe that such a little thing could bring down such a sturdy looking pole (and the P-I update mentioned a truck) . And we heard a Police officer telling someone that it was a truck.
Sadly, the Bottleneck has lost power for the evening, and Crush looks closed also.