The majority of murders in the U.S. occur in only a small percentage of counties across the country. The Crime Prevention Research Center (CPRC) said in a new report that there is a “geographical concentration” of murders, with 68 percent of killings occurring in just 5 percent of the nation’s counties. The homicides also tend to be concentrated to relatively small pockets of those counties, the report said. The report’s authors also looked at numbers from a 2013 REW Research Center survey, which found that the household gun ownership rate in rural areas was over two times greater than in...