"There were 511 officers killed in felonious incidents and 540 offenders from 2004 to 2013, according to FBI reports. Among the total offenders, 52 percent were white, and 43 percent were black."

Now, 6% of the population are black males.  31% are white males.  At 5 to 1 favoring white males, that means for every 5 white cop killers there should be only 1 black cop killer.... but there are 4.... a 400% anomaly.

https://www.washingtonpost.com/news/fact-checker/wp/2015/01/09/are-black-or-white-offenders-more-likely-to-kill-police/