Researchers at the University of Chicago’s Crime Lab said Tuesday they’ve crunched all the numbers and have been unable to find a clear cause for the dramatic spike in homicides in the city last year.

On Tuesday, the research group released its yearly report on gun violence in the city, citing possible causes, but failing to finger the exact reasons the city saw the largest year-over-year increase in homicides of any of the nation’s five largest cities in 25 years.

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