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The figures come from the Federal Bureau of Investigation's Uniform Crime Reporting (UCR) program, which collects information from nearly 18,000 law enforcement agencies in the U.S. on eight serious crimes, known as Part I offenses, and over twenty less serious offenses, known as Part II offenses. Part I offenses include four violent crimes — murder/non-negligent manslaughter, forcible rape, robbery, and aggravated assault — and four property crimes — burglary, larceny-theft, motor vehicle theft, and arson. The figures presented in the research overview are for all eight Part I offenses.