ZitatWASHINGTON — More than 20 major cities, including Chicago, Dallas, Las Vegas and Los Angeles, have seen large increases in murders in recent months, a spike that the director of the F.B.I. linked to less aggressive policing stemming from a “viral video effect.”
The new data released Friday showed clashing trend lines across the country, with many cities seeing a sharp increase in murders while rates in others — including New York and Miami — were down significantly from last year.
After receiving an advance look at the data, the F.B.I. director, James B. Comey Jr., expressed alarm Wednesday about the spike in murders in some major cities. Reigniting the debate over a “Ferguson effect,” he told reporters that he believed the trend could be linked to a “viral video effect” because officers were being less aggressive for fear of ending up on videos.
The White House distanced itself from Mr. Comey on the issue, named after Ferguson, Mo., where the 2014 shooting of an unarmed black man set off protests and rioting.
Josh Earnest, the White House spokesman, told reporters Thursday that “there still is no evidence to substantiate the claim that the increase in violent crime is related to an unwillingness of police officers to do their job.”
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Mr. Earnest said the president saw a false choice in any notion that police officers must decide between fighting crime and doing so in a fair way.
“The truth is the vast majority of police officers do both,” Mr. Earnest said.