Washington Attorney General Bob Ferguson is seeking legislation to ban the sale of assault weapons and high-capacity magazines.
He said Wednesday he'll ask lawmakers to introduce a bill next year to prohibit the sale of semi-automatic weapons with certain military-style features and prohibit the sale of magazines capable of holding more than 10 rounds.
Ferguson says such military weapons are designed to kill and they have no place in civilian use.
He and other leaders who spoke at a news conference in Seattle cited the deadly July shooting in Mukilteo. Authorities say a 19-year-old man used an AR-15 semi-automatic rifle to kill three former classmates at a house party.
Sen. David Frockt, a Seattle Democrat, says a number of states have passed similar legislation. He says Washington's proposal would grandfather in legally owned assault weapons.
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