From Reddit:
Tip: (Completely uncorroborated, so take at your own discretion!)
Source is a dispatcher...said that the cop who shot Mike Brown Jr was admitted to the ER and supposedly broke his jaw. One of his eyes also is supposedly nearly swollen shut. She also said that there were casings from a second gun found on the scene, which is why you are hearing ranges of how many shot the cop fired.
Vine Video, Jon Swaine:
https://vine.co/v/MYwHVh30XZF
She also said that there were casings from a second gun found on the scene
because the chief of police said in a press conference the day after that ALL the casings found at the scene were from the officer's gun.