Army to place large metal plates on DC streets to protect them from tanks during June parade

FILE - An M1 Abrams tank is displayed outside the Tank-Army Automotive and Armaments Command (TACOM) in Warren, Mich., Friday, May 13, 2005. (AP Photo/Carlos Osorio, file)

DETROIT (AP) — A 19-year-old man was arrested after spending months planning an attack against a U.S. Army site in suburban Detroit on behalf of the Islamic State group, authorities said Wednesday.

Ammar Said was planning to have another person commit a mass shooting at the Army’s Tank-Automotive & Armaments Command in Warren, but he didn't know that two supposed allies were undercover FBI employees keeping track of every step, the government said.

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