The 20-year-old suspect in the deadly Washington state mall shooting said nothing and appeared "zombie-like'' when he was arrested nearly 24 hours into an intense manhunt, police say.
Island County Sheriff's Lieutenant Mike Hawley said he spotted Arcan Cetin from a patrol car on Saturday evening in Oak Harbor, Washington, and immediately recognised him as the suspect who killed five people at the Cascade Mall in nearby Burlington.
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Lieutenant Hawley said at a news conference police had received information that Cetin, of Oak Harbor, was in the area.
Cetin, who immigrated to the US from Turkey, is a legal permanent resident who has been living in Oak Harbor, authorities said.
He had been arrested once before in the county for assault, Lieutenant Hawley said.
"I literally hit my brakes, did a quick turn, I jumped out,'' Lieutenant Hawley said. "We both jumped out with our guns, and he just froze.''
Cetin was unarmed and was carrying a satchel with a computer in it.
"He was kind of zombie-like,'' Lieutenant Hawley said.
The suspect's arrest capped a frantic search following the killings of five people the day before.
The first 911 call came in just before 7pm on a busy Friday at the Cascade Mall. A man with a rifle was shooting at people in the Macy's department store.
By the time police arrived moments later, the carnage at the Macy's make-up counter was complete.
Four people were dead, and the gunman was gone, last seen walking toward Interstate 5. The fifth victim, a man, died in the early hours of Saturday as police finished sweeping the building.
Mount Vernon police Lieutenant Chris Cammock said it now appeared the rifle was brought into the mall from a suspect vehicle that was there.
Cetin has not been charged, Lieutenant Cammock said. He will be booked into the Skagit County Jail and is expected to appear in Skagit County District Court on Monday.
As the small city absorbed the tragic news, critical questions remained, including the gunman's motive.
Initially the suspect was described as Hispanic, but Lieutenant Hawley said that was based on initial witness statements to the shooting.
The identities of the victims - the man and four women who ranged in age from a teenager to a senior citizen - were withheld pending autopsies and notification of family.
AP