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The number of police officers killed in the line of duty increased in 2014, a report by the National Law Enforcement Officers Memorial Fund finds.

In total, 126 officers were killed in 2014. That's a 24 percent increase from 2013, when 102 officers were killed. According to the report, the number of police officers killed by firearms also rose by 56 percent — from 32 in 2013 to 50 in 2014.

Here's a graphic that puts those numbers in historical context:

In a press release, the fund adds:

"Ambush-style attacks, as evidenced earlier this month by the shooting deaths of New York City Police Officers Wenjian Liu and Rafael Ramos while sitting in their marked patrol car, were the number one cause of felonious officer deaths for the fifth year in a row. Fifteen officers nationwide were killed in ambush assaults in 2014, matching 2012 for the highest total since 1995."

One important asterisk to this news: While gun deaths of officers have increased, they still remain 12-percent lower than the decade-long average of 57.

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