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The audit reviewed 1,287 homicide case files from 2001 to 2006, finding more killings are caused by arguments than by drugs and gangs combined.

During the past six years, there were 300 homicides resulting from arguments, compared with 270 drug-related killings and 17 homicides stemming from gang violence, according to a D.C. Office of Inspector General report.

The audit also found most homicides occur in the city’s poorest neighborhoods. Wards 7 and 8, with the highest unemployment rates, also had the greatest number of homicides, auditors found.

Auditors noted “wide fluctuations” in the number of homicides and the closure rates among the city’s wards.

The city’s wealthiest wards generally had the lowest number of homicides and highest closure rates, while closure rates in the Metropolitan Police Department’s 5th and 6th districts were lower.