Attorney general Eric Holder announced today that a federal investigation of nearly 600 incidents involving Cleveland officers indicates that the city's police department systematically uses excessive force. The investigation was opened in March 2013, well predating the recent killing of 12-year-old Tamir Rice by Cleveland officer Tim Loehmann.

From Cleveland.com: The investigation by six Justice Department lawyers, plus several independent policing experts, found that systemic deficiencies and practices haunt the city's police department. The problems include insufficient accountability, inadequate training, ineffective policies, and inadequate engagement with the community, according to a 58-page letter given to Jackson…