From the NYT:
So far in 2013, Chicago homicides, which outnumbered slayings in the larger cities of New York and Los Angeles last year, are down 34 percent from the same period in 2012. As of Sunday night, 146 people had been killed in Chicago, the nation’s third-largest city — 76 fewer than in the same stretch in 2012 and 16 fewer than in 2011, a year that was among the lowest for homicides during the same period in 50 years.
In recent months, as many as 400 officers a day, working overtime, have been dispatched to just 20 small zones deemed the city’s most dangerous. The police say they are tamping down retaliatory shootings between gang factions by using a comprehensive analysis of the city’s tens of thousands of suspected gang members, the turf they claim and their rivalries. The police also are focusing on more than 400 people they have identified as having associations that make them the most likely to be involved in a murder, as a victim or an offender.