Pembrokeshire Roads Policing Unit arrested four people accused of being concerned in the supply of heroin yesterday (Friday).
Officers stopped a vehicle near Llanddowror, near St Clears, and arrested all four occupants on charges of being involved in supplying the class A drug.
One occupant was also arrested for recall to prison and another for breach of bail.
Police said that the vehicle was seized, as it had no insurance, and a quantity of heroin was recovered.
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