4: MASS SHOOTINGS: Throughout the year, mass shootings brought grief to communities across the U.S. and deepened frustration over the failure to curtail them. There were 14 victims in San Bernardino. Nine blacks were killed by a white gunman at a Charleston, South Carolina, church; a professor and eight students died at an Oregon community college. In Chattanooga, four Marines and a sailor were killed by a Kuwaiti-born engineer; three people, including a policeman, were shot dead at a Planned Parenthood clinic in Colorado.