Yes, there were police searching backyards up and down Morris Street, with a dog, Sunday evening. From what I heard, they were looking for a person. I'll be looking for more information (they asked me to stay inside in order to not confuse the dog), but meanwhile, here are my live tweets from my front window (in reverse chronological order).

UPDATE 12/15/09: I still have no official information, but according to Jade's comment below, the search encompassed several streets, including Morris, Stanton, and Fargo, and she was told that police were searching for a robbery suspect.