Washington, D.C. ? The murder rate jumped by more than 10 percent among dozens of large U.S. cities since 2004, a study shows in the latest sign of the end of a national lull in violent crime.

Robberies also spiked, as did felony assaults and attacks with guns, according to the report to be released today by the Police Executive Research Forum, a Washington-based law enforcement think tank.

FBI data similarly have shown a rise in violent crime – if not as dramatic – since 2004. The Justice Department says crime was historically low that year.

The report surveyed crime rates in 56 large U.S. metropolitan areas including Los Angeles, Chicago, Dallas and Washington. It did not include violent crime rates in New York, the nation’s largest city, which did not participate in the voluntary survey. An advance copy of the report, titled “Violent Crime in America: 24 Months of Alarming Trends,” was obtained by The Associated Press.