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.

Investigators recorded audio and video images of their meetings with Said, including handwritten diagrams of the site, which is known as TACOM and the Detroit Arsenal.

Said, a recent member of the Michigan Army National Guard, was arrested Tuesday shortly after launching a drone for a final look before an attack, the FBI said in a court filin

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