The Drug Squad this morning discovered an undisclosed amount of heroin in a residence in Mosta.
The police said that it has arrested six men hailing from Naxxar, Mosta and St Paul's. Their ages range between 19 and 32.
Drug abuse related items were also found.
The police also said that it was evident that the drug was intended to be sold and that the house was used for heroin trafficking.
More investigations are being held.