Arcan Cetin, 20, was taken into custody Saturday night after a nearly 24-hour manhunt, authorities said.
Four women and one man died in the shooting Friday night at a Macy’s store at the Cascade Mall in Burlington, just north of Seattle.
The victims’ identities have not been released.
Authorities arrested Cetin as he walked down the street near his home in Oak Harbor, Washington.
When officers confronted him, he did not run, said Lt. Mike Hawley of the Island County Sheriff’s Office. Instead, he froze and complied, Hawley said. Cetin was not armed at the time of his arrest.
“He said nothing,” Hawley said. “Just kind of zombie-like.”
While more details emerged on the suspect after his arrest Saturday night, the motive remains unknown.
Cetin emigrated from Turkey and is a legal permanent resident of the United States, authorities said. It’s unclear when he moved to the US.
State authorities said it’s too early to rule out terrorism or any other motive because their investigation is in its preliminary stages. Before the suspect’s arrest, an official with the FBI had told reporters there was “no evidence at this time” of a link to terrorism.
Authorities say Cetin walked into the mall, about 65 miles north of Seattle, and opened fire with a rifle Friday night. He allegedly fled the mall afterward, sending more than 24 law enforcement agencies on a manhunt across the state.
Authorities collected evidence from the mall overnight Friday and all day Saturday as the bodies were removed from the premise. Eventually, they identified his vehicle by matching information received from a tip with surveillance footage obtained from local business.