P, cannabis, Ecstasy, $700,000 cash, an AK-47, two other firearms and five cars were found by police in a series of searches in Manawatu recently.
Officers searched a number of homes and storage facilities in Palmerston North, Feilding and Ashhurst as part of Operation Zippo, targeting organised crime in the area.
Detective Sergeant Dave Thompson said 13 people have been arrested so far - with four people arrested just yesterday.
He said a specialist drug dog was used in the searches, which found: 580g of methamphetamine, 1.2kg of MDMA, 10kg of cannabis plants, 175g of hashish, 300ml of Fantasy, three guns including an AK-47 and $699,000 in cash.
Five cars, including European models, were also recovered.