Whanganui police have seized thousands in cash and a kilogram of illicit drugs following search warrants in the area.
Operation Arch is part of ongoing efforts to target the distribution of illegal drugs in the Central District.
The Whanganui Organised Crime Unit (OCU) seized around $70,000 in cash, 1kg of methamphetamine and other controlled drugs were seized late last week.
Four people have appeared before the courts on related charges.
Three men, aged 46, 47 and 53 and a woman, 31, appeared in Levin and Whanganui district courts on November 23 and 24.