http://www.ojp.usdoj.gov/newsroom/press ... S10133.htm
about seven percent . . . involved some form of violent victimization . . .
Victims said they knew the offender in 65 percent of violent household burglaries, and in 28 percent of such burglaries victims said the offender was a stranger. Residents in all of these households were equally likely to be victimized by a current or former intimate partner as they were by a stranger.
Offenders were unarmed in 61 percent of the violent household burglaries that occurred between 2003 and 2007. In 12 percent of violent household burglaries the offender possessed a firearm. About 23 percent of these firearm-related burglaries were committed by a stranger.