The report, by the department's Bureau of Justice Statistics, painted an encouraging picture of long-term trends at a time of divisive political debate over guns and legislation to regulate them. Firearms-related homicides declined 39 percent between 1993 and 2011, the report said, while nonfatal firearms crimes fell 69 percent during that period.
Yet the document also made clear that when people are killed, it is still most likely to be with a gun. In 2011, as in the past two decades, about 70 percent of all homicides were committed with a firearm, and the majority of those firearms were handguns.
The report, which echoes earlier findings of reductions in violent crime from the FBI's Uniform Crime Report, comes amid an intense divide over guns, especially since December's massacre of of 20 children and six adults at a school in Newtown, Conn.
Newtown thrust gun control to the top of President Barack Obama's second-term agenda, and the White House pushed hard for a series of gun-control measures. But the effort unraveled under pressure from the gun rights lobby, and every major proposal was rejected on the Senate floor.
The biggest setback for the White House was the defeat of a compromise measure to expand background checks for firearms purchases. Gun-control proponents have since mobilized to revive the push for stricter gun laws, but gun rights groups might seize on one finding in Tuesday's Justice Department report to argue against enhanced background checks.
Fewer than 1 percent of state prison inmates who possessed a gun when they committed their offense obtained the firearm at a gun show, the report said. Gun shows were central to the measure recently rejected in the Senate: It would have extended the current background-check requirement for firearms purchases from covering only sales at licensed dealerships to any sale that takes place at a gun show or was advertised in print or online.
About 40 percent of state prison inmates obtained their firearms from illegal sources such as theft or through a drug deal, the report said, while 37 percent got their guns from a family member or friend. Those findings are based on data from 2004.
Overall, the Justice Department report said, firearm-related homicides dropped from 18,253 homicides in 1993 to 11,101 in 2011, while nonfatal firearm crimes declined from 1.5 million in 1993 to 467,300 in 2011. The drop extended to schools: Homicides at schools declined from an average of 29 per year in the 1990s to an average of 20 per year in the 2000s.
Although the rate of firearms homicides for African Americans declined by 51 percent over the past two decades, that rate was still 14.6 per 100,000 people in 2010 - compared to 1.9 for whites.
In 2010, the South had the highest rate of firearms homicides nationwide at 4.4 per 100,000 people, the report said. That compared to 3.4 in the Midwest, 3.0 in the West, and 2.8 in the Northeast.
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