“Officer down!” an officer screamed frantically into his police radio Sunday morning in Baton Rouge, La. “Shots fired! Officer down!”One of the most dreaded calls in policing triggered a surge of officers to the city’s Airline Highway, not far from Police Headquarters, an agonizing replay of the distress calls 10 days earlier that prompted the Dallas police to scramble to the aid of their fallen colleagues.The twin attacks — three officers dead Sunday  in Baton Rouge, five killed on July 7  in Dallas, along with at least 12 injured over all — have set off a period of fear, anguish and confusion among  the nation’s 900,000 state and local law enforcement officers. Even the most hardened veterans call this one of the most charged moments of policing they have experienced.



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