I agree that it is disturbing in this situation how quickly the officers open fire after rolling up. I believe this situation needs a complete investigation by an independent agency. In many state, a state-level police organization would investigate a local police shooting like this (in NC the state organization is called the SBI).
After the shooting, one of the cops described the 12-year-old as 20 years old! How does one confuse a 12-year-old kid with a 20-year-old? That's some crazy level of bias to not be able to judge age outside your race any better than that. In the following account, we see where two White cops blithely accept the claim from a White kidnapper-rapist-torturer and murderer that his 14-year-old Asian victim who escaped is in fact the monster's "19-year-old lover." The cops return the unfortunate kid to his attacker.