Authorities say juvenile charges of aggravated battery with a deadly weapon have been filed against a 12-year-old New Mexico boy suspected of opening fire on classmates in a Roswell middle school.

State Police Lt. Emmanuel Gutierrez Thursday confirmed three charges have been filed against the boy, who authorities say brought a shotgun to school in a duffel bag and fired three rounds in the gymnasium Tuesday morning as students were gathered, waiting for classes to begin.

The suspect, who FoxNews.com will not identify because he faces juvenile charges, allegedly opened fire with a .20-gauge shotgun in a gymnasium with 500 fellow students. A teacher has been credited with talking the suspect into putting his weapon down after police say he fired three shots.

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An 11-year-old boy was critically injured after being hit in the face and neck. A 13-year-old girl was hit in the shoulder. A school employee also suffered minor injuries. The 12-year-old accused in the shooting was transferred to an Albuquerque psychiatric hospital following a hearing Tuesday.

Meanwhile, The Albuquerque Journal reported that students at the Berrendo Middle School resumed classes Thursday and were greet by well-wishers carrying balloons and signs in a show of support.

Rebecca Taylor, who helped organize the rally, told the paper "This just shows it wasn’t just the school that was impacted."

The Associated Press contributed to this report