The California attorney general's office on Tuesday joined an investigation into the fatal shooting of an unarmed black man by Sacramento police to provide independent oversight.

Clark was killed by two Sacramento police officers who were responding to a report of someone breaking car windows in a South Sacramento neighborhood. Police thought Clark was holding a gun, but he was found with only a cellphone.

Attorney General Xavier Becerra's office will provide oversight of the investigation and conduct a review of the police department's policies and training around use of force. Body camera footage released by the department shows police firing 20 rounds at Clark.

With files from the Associated Press.

Guest:

Dale Kasler, reporter for the Sacramento Bee; he's been following the story