The Uniform Crime Reports (UCR) contain official ata on crime that is reported to law enforcement agencies across the country who then provide the data to the Federal Bureau of Investigation (FBI). UCR focuses on index crimes, which include murder and non-negligent manslaughter, robbery, forcible rape, aggravated assault, burglary, larceny/theft, motor vehicle theft, and arson. UCR is a summary-based reporting system, with data aggregated to the city, county, state, and other geographic levels. Crime statistics are compiled from UCR data and published annually by the FBI in the Crime in the United States series. To address limitations of UCR, the FBI has developed the National Incident Based Reporting System (NIBRS) system, which is slowly being deployed by law enforcement agencies.