I was at a GSSF match. The match was held at a city's P.D. range all R.O.'s , M.D.'s etc. were LEO's. Huge bay that held two stages. At the buzzer I started to shoot, front sight comes on a popper dark blue and something moving in my just out side my vision. I stopped and looked TWO LEO's and the shooter from the stage on my right were walking right in front of my targets [ to the side and 5-8 yards down range. NOT ONE PERSON SAID ANYTHING, this includes shooters, spectators, etc I had to tell the the cop that was R.O ing me what was going on.