You actually have to follow several link to get a firsthand news source on this story. The quote on Dollard's page is not firsthand.
The state's attorney's comments come as a result of the Danbury News Times and several other news organizations challenging the gag order. Here's the New Times article on what the state's attorney said.
You can go read it for yourself. It does not mention any other shooters and he expects there will be no arrests in the case.