Detectives from Organised Crime Branch arrested three men and a woman after a number of searches at properties in West Belfast yesterday.
Police said a quantity of cash was seized during the operations.
Detective Inspector Pete Mullan added: "The searches were conducted at addresses in Clonavogie Gardens, St James Drive, St James Road and Springfield Road.
"A 29-year-old man was arrested on suspicion of possession of a Class A controlled drug and possession of a Class C controlled drug.
"A 30-year-old man was arrested on suspicion of possession of criminal property and possession of a Class A controlled drug while a 33-year-old man was arrested on suspicion of possession of criminal property.
"All three men have been released on police bail pending further enquiries.
"A 57-year-old woman was arrested on suspicion of possession of a firearm or ammunition in suspicious circumstances, possession of a prohibited weapon, possession of criminal property and a number of drugs related offences. She has been released on police bail pending further enquiries.”
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