Police: Man read gun manual just before attack on party

SEATTLE (AP) — A 19-year-old man who shot and killed three people at a party in suburban Seattle was so unfamiliar with his newly purchased AR-15 semi-automatic rifle that he parked his car across the street and read the firearm's instruction manual just before the attack, police wrote in a probable-cause statement made public Monday.

Allen C. Ivanov was arrested by state troopers on Interstate 5 early Saturday more than 100 miles from the bloody scene in Mukilteo, a north Seattle suburb, authorities said.

Ivanov had bought the assault-style weapon about a week before the attack, saying he planned to use it for target practice and that he had signed up for a gun-safety class this month, Mukilteo Police Detective John Ernst wrote in the probable-cause statement.

Ivanov said he entered the house through a side door, found Bui and shot her twice, then continued through the house, saw through the front door another man running toward the house and shot him, according to the probable-cause statement.