Tactical Tamer

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okay im going to try and solve this mystery about who did what so if you have any clues plz tell me to try and help me solve this crime. One truth will prevail(sorry just had to say that lol)

CLUES
clock rings 5 min before noon
shot fired at gambino came from durem
person who fires gun must be a good with a gun
SUSPECTS
Sisters-neither is the shooter but may be involved.