Baltimore Police arrested a 17-year-old Friday on firearm charges in connection to last weekend’s mass shooting that wounded 30 people, including two fatally, the same day sources said more than a dozen guns were fired at the scene.

       Police recovered shell casings from at least 12 guns from the scene of the mass shooting, according to sources with knowledge of the investigation. It’s not known exactly how many shooters there were — one shooter could have used two guns, for example — or if all the shell casings were tied to the mass shooting at the Brooklyn Homes early Sunday morning.

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       Detective Freddie Talbert, a spokeswoman for the police department, said Friday afternoon that the teen’s arrest was the only one police had made so far but that there are “multiple” suspects.