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Despite the increase in the number of gunfire deaths from 2008, there have been fewer overall officer deaths so far this year: 117, compared with 125 last year, according to the statistics. The major reason is that traffic deaths are down 24 percent.

“The chances of being killed in the line of duty are lower than they have been in modern times,” Mr. Morison said. “But no one is immune to the dangers of the job.”