CHEHALIS, Wash. -- Deputies seized 1,345 marijuana plants after a 10-month investigation led them to three homes where they served search warrants on Wednesday morning, the Lewis County Sheriff's Office said.

The marijuana plants had a street value of $1.3 million and were part of a large operation that included halide lights, ventilation systems and electrical equipment, deputies said.

One person was arrested and two vehicles were seized in the 7 a.m. raid by the Lewis County Sheriff’s Office Task Force, the Unified Narcotics Enforcement Team, the Drug Enforcement Administration, the Yakima County Drug Task Force and the Washington National Guard.

Deputies said the investigation is continuing and more arrests are expected.