The shooter, 51-year-old Gabriel Wortman, also killed pets, the Royal Canadian Mounted Police (RCMP) said in an update to their investigation into the killings.
"It was a significant assault, and this individual female did manage to escape, and that could very well have been the catalyst to start the chain of events."
The gunman expressed extreme right-wing views in a letter of confession he left behind before opening fire at two shisha bars, newspaper Bild reported on Thursday.
"Detectives are investigating after six people were wounded by gunfire, one fatally," Seattle police said on Twitter.
“My boyfriend has a lot of guns,” Lapkin, 79, said of her 83-year-old boyfriend. “He said, ‘You want to go to the rally?’ I said, ‘Are you out of your mind?'”
Immediately following the initial exchange in fire, a large security unit led by the Northern District Police Commander was summoned to the scene to defuse the situation.
Footage of school coach Keanon Lowe disarming then-18-year-old Angel Granados-Diaz in May has been released to the public.
The retailer said it took the action following the death of 22 people in a mass shooting in a Walmart store in Texas.
Andreychenko was arrested after walking out of the store with his weapon, Springfield police said. No shots were fired in Thursday's incident.