A 24 year-old man is being questioned following a drugs raid in Cardiff Bay.
Armed police accompanied neighbourhood officers during the search at an address on Burt Street on Thursday.
Around £600 worth of class A drugs was seized, after detectives received intelligence about anti-social behaviour and drug misuse at the property.
The suspect, arrested on suspicion of possessing Class A drugs with intent to supply, remains in custody.
According to South Wales Police, the raid was carried out as part of an ongoing campaign.
Inspector Abi Biddle said: "Drug dealing and misuse will not be tolerated. The Project Pinpoint campaign is about encouraging communities to report any behaviour they find troubling so we can gather vital intelligence that allows us to take appropriate action."
"We will continue to act on information received from members of the public accordingly."

£20 million regeneration Plan submitted to the UK Government
Popular Barry Island Chippy announces its closure
Missing Penarth man found after appeal
Parc prison expansion plan ''ill-judged''
Panto stars drop in at Penarth hospice
Ruth and Steve go training with the RNLI
Aberthaw: trespassing banned at power station
New trains coming to Vale line in 2026
Council approves next step in Crossrail scheme
Aberthaw turbine donated to aviation museum
Council publishes 2025 self-assessment
Calls to ‘eliminate’ small business rates rejected
Lifeboat crew commended after complex rescue
Cladding repairs 'nowhere near acceptable pace'
More council cash in budget deal
Council boss joins CCR Energy
Senedd backs bus shake-up
Labour and Plaid strike £300m budget deal