A rare quadruple homicide occurred Saturday night in Sacramento. Authorities attributed the killings to an alleged gang member.
Like most large cities, Sacramento has long struggled with gangs, and homicide trends often correspond to the ebb and flow of gang conflict.
This map shows informational reports taken by police when a resident or cop sees something gang-related -- say, youths hanging out and exchanging hand signals or multiple kids together wearing the same colors -- that doesn't rise to the level of an actual crime. These give an indication of where gangs are most active, but only scratch the surface of gang activity in the city.
Source: Sacramento Police Department