In Baton Rouge, police say the former U.S. marine who killed three police officers Sunday was in the city specifically to target police. The shooter, 29-year-old Gavin Long, recorded videos that were posted online under the pseudonym Cosmo Setepenra before he shot six police officers, killing three. In the videos, Long discusses police shootings of African Americans, including the death of Alton Sterling, who was shot and killed by police officers in Baton Rouge earlier this month.