The man who shot and killed two New York Police Department officers in Brooklyn Saturday expressed anger against the government for the deaths of Eric Garner and Michael Brown on social media and had previously attempted suicide, officials said Sunday. At a press conference, NYPD Chief of Detectives Robert Boyce said that 28-year-old Ismaaiyl Brinsley, who fatally shot himself in the head after killing NYPD Officers Rafael Ramos and Wenjian Liu, had no gang connections and had not been radicalized. Boyce said police were still investigating Brinsley’s Instagram account on which he posted a photo of the gun he would use in...