The phrase "police bullets" refers to the ammunition or bullets used by police officers in their firearms for self-defense or to maintain law and order. Full definition
It did so in the case of Michael Brown, the unarmed African - American killed by police bullets in the St. Louis suburb of Ferguson three years ago this week. (nytimes.com)
An unarmed West African immigrant with no criminal record, Diallo, then 22 years old, was killed in the Bronx on Feb. 5th, 1999 by police bullets in the Bronx. (manhattantimesnews.com)
The actor was busiest during the «film noir» mid-to-late 1940s, playing several weasely villain roles; it is hard to forget the image of Corey, in the role of a slimy stoolie in Burt Lancaster's Brute Force, being tied to the front of a truck and pushed directly into a hail of police bullets. (rottentomatoes.com)