From the article:
The homicides also tend to be concentrated to relatively small pockets of those counties, the report said.
“It is stunning how concentrated murders are in the U.S.,” John Lott, president of the CPRC said to Fox News. “And we show that even within these counties, with all these high rates, murders are very concentrated.”
Indianapolis, Indiana had 135 murders but only four occurred outside of the 465 highway loop that encircles the downtown area.
Washington, D.C. has large swaths without a single recorded murder. The study found that murders were overwhelmingly limited to the eastern half of Washington, D.C.
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My comment:
These ultra-high crime areas are what are euphemistically labeled "urban centers", which is the poltically-correct designation for areas where one cannot state the obvious for fear of being labeled "racist", even though those numbers, by race, are easily available from the FBI.