Southland Police have arrested eight people and seized drugs, firearms and cash during a series of search warrants last week

Operation Diablo, led by the region's Organised Crime Group and Criminal Investigation Branch, targeted gang-related drug offending.

Detective Senior Sergeant Greg Baird says officers seized 32 grams of methamphetamine, cannabis, firearms and more than three thousand dollars in cash.

He says those behind the trade show no regard for the harm they cause, and police will continue targeting anyone involved.

He adds that further arrests are possible.