"Stops save lives,"Mr. Browne said. He estimated that over the past 10 years, there were 5,628 fewer homicides than in the decade before Mr. Bloomberg took office.

"That is a remarkable achievement--5,628 lives saved--attributable to proactive policing strategies that included stops," Mr. Browne said.

Homicides were down 4% in 2011 and remained under 600 for the 10th straight year. Overall, major crime, which includes violent offenses and serious theft, ticked up by less than 1%.

Mr. Browne said 8,263 weapons, including 819 guns, were recovered as a result of stops.