Police arrest, identify shooter who killed 5 at mall in Washington State https://www.rt.com/usa/360535-burlington-wa-mall-shooter-arrested/ Later in the day, police gave details on the suspect. Arcan Cetin, a 20-year-old Turkish national and legal permanent resident in the US, was arrested for assault last year in Island County, according to KOMO News. The suspect was formally charged and will be booked into the Skagit County Jail, police officials added.