3-dead and 7-injured is much like 37. Shooting = 37 (RR)
This shooting came on the 28th of July. Shooting = 107 (107, the 28th prime)
The shooting has resulted in a 'manhunt'.
Also, the date numerology connected to 'shooting' as well.
7/28/18 = 7+28+18 = 53
Notice July 28 leaves 156-days left in the year...
False Flag = 156 (Jewish)
Thirty-Three = 156 (Ordinal)
Police = 33 (Reduction)