Federal prosecutors have charged a 19-year-old man from the Seattle area with being part of a failed terrorism plot over Halloween weekend in Metro Detroit — the eighth person ensnared in the alleged scheme.

Saed Ali Mirreh, a U.S. citizen from Kent, Washington, was arrested by federal agents Wednesday in his home state following a two-year investigation that started with a tip and intensified after FBI agents conducted a series of raids one week ago on Halloween in Dearborn and Inkster and arrested five people in Michigan.

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