The Crescent is home to 27 percent of the city's residents and 80 percent of the city's homicides. The reasons behind the burst of violence include the lagging upstate economy, a steady migration of residents to the suburbs and a growing number of abandoned houses prone to become centers of drug sales and use. Rochester also has a school system that performs poorly. People inside the Crescent experience those problems in greater concentration. ''It's an area of great poverty and high consumption rate of drugs which fuels an incredibly high number of homicides,'' said the Rochester police chief. Rochester, NY. USA 2012