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Handcuffs photographed Tuesday, December 26, 2017.

In certain parts of America’s largest cities, the vast majority of homicides go unsolved, without any arrests ever made in connection to the killings, according to an in-depth data analysis by the Washington Post.

In these areas, “murder is common but arrests are rare,” according to the Washington Post analysis, which was published online Wednesday. The Post analyzed up to a decade of data from 50 of America’s largest cities, including Baton Rouge and New Orleans.

New Orleans, the Post found, has 14 areas across the city with a high concentration of homicides but a low arrest rate. These areas include parts of Central City, Mid-City, New Orleans East, the 7th Ward, the Lower 9th Ward and Algiers. New Orleans has no areas with both a high concentration of killings and a high arrest rate, according to the Post analysis.

Of the 50 cities analyzed, New Orleans has the second-lowest arrest rate for homicides at just 35 percent over the last eight years, the Post found. Only Chicago, which has a 26 percent arrest rate over the past 10 years, was lower. The combined average arrest rate for the 50 cities analyzed by the Post is 49 percent.

Both the number of homicides and the arrest rate have decreased in New Orleans in the past eight years, according to the Post analysis.

Like most of the other cities, a homicide involving a white victim is more likely to be solved than a homicide with a black victim, the Post analysis found. In New Orleans, the arrest rate for homicides with minority victims is about 39 percent, compared to more than 50 percent for homicides with white victims.

In Baton Rouge, the Post found two regions, both in north Baton Rouge, where a high number of homicides occur but where less than one in three of those killings is solved. Another area in north Baton Rouge, however, showed that a high number of homicides occurred there, but the majority were solved.

Over the last seven years, the homicide rate in Baton Rouge has continued to increase, while the arrest rate has dropped, according to the Post analysis.

To see the data for each of the 50 cities analyzed, click here. For the full Washington Post story, click here.