A grand jury has indicted a suburban Dallas teenager who authorities say was planning a mass shooting at a mall inspired by the Islamic State terror group.

Seventeen-year-old Matin Azizi-Yarand was indicted Thursday on charges of making a terroristic threat and soliciting the capital murder of a peace officer. Authorities allege he spent more than $1,400 buying weapons and tactical gear, and had been trying to recruit others to help him in the shooting.

He's been held at the Collin County jail since his arrest in May at a high school in Plano.

His attorney, Mitch Nolte, tells The Dallas Morning News that they look forward to seeing the evidence the state claims, and challenging the case in court.

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Information from: The Dallas Morning News, http://www.dallasnews.com