Police served a search warrant at a storage unit owned by Josh Powell on Tuesday night, the Pierce County Sheriff's Office said.
Police told KIRO 7 news partner The News Tribune officials from the West Valley City, Utah, police force were there, but weren't looking for anything specific.
Powell's wife, Susan Cox Powell, disappeared in Utah two years ago, and West Valley City police are handling the investigation. Police revealed earlier Tuesday that Susan's disappearance has been a murder investigation for several months.
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