The U.S. Army said the presence of helicopters and armed soldiers in a Houston neighborhood were due to a training drill.

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The commotion Monday afternoon at the old Carnegie Vanguard High School, which was closed in 2009, resulted in several calls from concerned residents to KTRK-TV, Houston, about military helicopters, armed soldiers and sounds of gunfire, KTRK-TV reported.

"When you see this, you think the worst. When you hear this, you think the worst," resident Frances Jerrals said.

The Army said the incident was a multi-agency training exercise at the shuttered high school. No details about the nature of the training were released.