A man is expected to be arraigned in Court tomorrow, charged with drug association, trafficking and possession.
The police said in a statement that the man was arrested following a drug find in St Julian's earlier today.
Following weeks of investigations, the police this morning stopped the 27-year-old man from Qormi, who lives in St Julian's, and found him carrying 250 grammes of cannabis and a capsule of cocaine.
The police then searched a garage nearby being used by the man and there it found more drugs.
Altogether, they found more than 15 kilogrammes of cannabis, 537 ecstasy pills and around 10 grammes of cocaine.
An inquiry is being held.