Head of the Manchester police, Superintendent Lloyd Darby says suspects have been arrested in connection with two of three murders in the parish on Saturday.
Those killed are 35 year-old Adrian Smikle, 15-year-old Vesteroy Sinclair and 49-year-old Ricardo Bennett.
Smikle was shot dead at a wake in Heartease, and Sinclair was shot dead during an attempted robbery at his family home in Turner Stop District.
Both incidents happened close to 10:00pm on Saturday.
Earlier in the day, Bennett was shot by a gunman in Mandeville at about 2:00pm.
He died at hospital.
