Drugs were discovered after police descended on a house.
Police officers attended an address in Collyer Avenue, Bognor, on Sunday to make an arrest in relation to a criminal damage incident on October 15.
A 16-year-old local boy was arrested on suspicion of criminal damage and possession of a knife.
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Another man, 18, from Bognor, was found at the address and also arrested on suspicion of threat to damage property in relation to the same incident.
Drugs were found at the property which led to an 18-year-old man and a 45-year-old woman, both from Bognor, also being arrested, on suspicion of being concerned in the supply of class A drugs.
All four suspects remain in custody at this time. Investigations into the incidents are ongoing.
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