NEW YORK (AP) -- In a story Oct. 12 about gun violence research, The Associated Press reported erroneously that Newtown, Connecticut, was the deadliest mass slaying at a school in U.S. history. With 26 victims, it was the second-deadliest shooting at a school; 32 were killed at Virginia Tech in 2007. The worst attack at an elementary school was a 1927 bombing that killed 38 children in Bath Township, Michigan....