A survey by the Police Executive Research Forum in 163 US cities shows that 65 percent of them reported increases or no changes in homicides during the first half of 2007, 41.9 percent of cities reported increases or no changes in aggravated assaults, 55.6 percent reported increases or no changes in robberies (Survey Shows Shift in Violence, USA Today, October 12, 2007). In New Orleans, 209 homicides were recorded in 2007, a 30 percent increase over that of 2006 (New Orleans Homicides up 30% Over '06 Level, USA Today, January 3, 2008). Washington D.C. recorded 181 killings in 2007, jumping 7 percent over 2006 (Killings in D.C. up After Long Dip, The Washington Post, January 1, 2008). Baltimore recorded 282 homicides last year (City Marks First '08 Slaying. The Baltimore Sun, January 2, 2008) and 428 killings were logged in New York by the end of November (City Homicides Still Dropping, to Under 500, The New York Times, November 23, 2007). From January to September, Chicago recorded 119,553 criminal offences including 341 murders and 11,097 robberies (Chicago Police Department, http://egov.cityofchicago.org). From January to November, 737 people were murdered in Los Angeles, namely two were killed every day (World Daily, December 4, 2007). In Detroit, rampant violent crimes have forced many residents to find new homes elsewhere, and the city's population has declined by nearly 1 million since 1950, according to the Census Bureau (Study: Detroit Most Dangerous City, the Associated Press, November 18, 2007).

The United States has the largest number of privately-owned guns in the world. Frequent gun violence poses a serious threat to people's life and property security. There are an estimated 250 million privately-owned firearms in the United States. Almost every American, even ex-criminals with felony records and minors, has firearms. The Associated Press reported on January 29, 2007 that about 410,000 Floridians were licensed to carry hidden guns, including 1,400 who had pleaded guilty or no contest to felonies, thanks to loopholes, errors and miscommunication of authorities.