The Baltimore Sun's blog "Unleashed" has done an amazing job of staying on top of the Bear Bear story. Check their blog often, they have posted several updates today. The last two state that security is tight for tonight's meeting at the dog park, and the Humane Society is now investigating the incident as well.
There are also now two Facebook groups called "Justice for Bear Bear". Here is the first one, and here is the second.
There is also an online petition demanding justice for Bear Bear.