The Washington State man accused of killing three people at a party on Friday night with an AR-15 read the rifle's instruction manual just moments before opening fire, court records show.
Allen Ivanov, 19, told detectives he bought the semi-automatic rifle a week ago for target practice and had even scheduled a safety class for August, NBC News reported.
But Ivanov instead brought the gun with him to a party that his ex-girlfriend was attending in Mukilteo, a Seattle suburb, investigators say.
After seeing her with another man at the party, he returned to his car, fetched the rifle, read the instructions and loaded its magazine.
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Ivanov, who is being held without bail at the Snohomish County Jail, was charged with two counts of first-degree murder and one count of first-degree aggravated murder. It wasn't immediately clear if he had a lawyer.