St. Louis County Police arrest people along West Florissant Avenue, Monday, Aug. 10, 2015, in Ferguson, Mo. Ferguson was a community on edge again Monday, a day after a protest marking the anniversary of Michael Brown's death was punctuated with gunshots.

776 People Killed By Police So Far in 2015, 161 Of Them Unarmed

But, just 25 police officers have died from firearms-related violence in the same period.