An eight-month investigation conducted by the King County Sheriff’s Office resulted in the seizure on Wednesday of narcotics, guns, money and the arrest of eight people for trafficking narcotics, including at two locations in Renton, according to the Sheriff’s Office.

The seizures in Renton occurred at a storage unit in the 3600 block of East Valley Road and a residence in the 17300 block of 121 Lane.

Seven of the eight adults were family members; six children were placed in CPS custody, according to Sgt. Cindi West, a spokeswoman for the King County Sheriff’s Office.

Seized were:

— 1.25 pound of cocaine with a street value of $22,000

— 6 ounces of heroin with a street value of $2,000

— $65,371 in U.S. currency

— 5 firearms all of which appeared to be packaged for transport into Mexico

— 5 vehicles valued at $60,000

The investigation started in April when sheriff’s detectives learned that a narcotics dealer had a reputation of selling high-quality cocaine and heroin in the Burien area, according to West.

Detectives also learned that the suspect had been sought by investigators before for dealing narcotics but would shut down his operation when he suspected police were closing in, according to West.

Detectives spent months conducting surveillance on the suspect’s residence and other locations they learned were connected to the operation.  On Wednesday the King County Sheriff’s Office served search warrants on six locations, which included two residences in Burien and a house in Federal Way.

The suspects are all from Mexico, according to West.

 “We believe the ammo that we found was packaged to ship to Mexico,” said the lead detective, who wasn’t identified. “ It had been wrapped in multiple layers of tin foil and dryer sheets (like Bounce) and multiple layers of cellophane. They do this cause they think the dryer sheets will throw off the dogs and the tin foil will beat an X-ray machine.”