Officers attended a property on Newland Grove, Hull, on Wednesday 23rd March.
Upon entering, officers discovered Class A drugs worth an estimated £3,000, approximately £1,500 of cash and a suspected firearm.
Two men from Bradford, one man from Hull and two juveniles from Hull have been arrested in connection with County Lines drug dealing and remain in police custody whilst their investigations continue.
Anyone with information around drug offences can get in touch with them by calling their non-emergency number 101, or you can report anonymously by calling Crimestoppers on 0800 555 111.
To find out more information about county lines, visit County Lines | Crimestoppers (crimestoppers-uk.org)