Two of the victims have so far been identified. They are 63 year old Ruthven Sandy, of Marabella, and 48 year old Michael Scott, of Carat Hill in Gasparillo.
According to reports, two gunmen entered the Caribbean Vibes Bar along the Southern Main Road at around 11pm on Wednesday, and opened fire.
Scott and the unidentified man died at the scene, while Sandy succumbed to his wounds at the San Fernando General Hospital.
Police believe Scott was the target.