Serious crimes reported to law enforcement agencies throughout the United States increased during the first six months of 1988, when compared to the same period last year, the FBI reported. According to the bureau's Uniform Crime Reporting Office, the violent crimes of murder, forcible rape, robbery and aggravated assault increased 5% as a group. At the same time, the property crimes of burglary, larceny, theft and motor vehicle theft increased 1%. Regionally, the Northeast reported a 7% increase in violent crime; the Midwest, a 1% increase; the South, a 6% increase, and the West, a 4% increase. For property crime, the Northeast reported a 3% increase; the Midwest, a 2% decrease; the South, a 2% increase, and the West, a 1% increase.