Sounds like the bull that has been going on here on the south side. You can read up more here. Or grab some Google news action.

Basically a bunch of punks between 14-16 think its cool to attack males walking alone. It has been going on for quite a while now. I have heard about some attacks on the bike path at night as well. Most of the attackers have been from Kenwood Academy (5015 South Blackstone). Lately this has become the cool thing to do for these punks. People say that the attacks have been dying down though. I would still keep an eye out.