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Editor's Note: Police said Tuesday the gun was an AR-15, but corrected that Wednesday to say it was a Mossberg .22-caliber long rifle.

WATERLOO -- An elementary-aged boy was taken into custody Monday evening after police found him carrying a semi-automatic rifle in a pillow case.

A Waterloo Police officer spotted three boys carrying a pillow containing what appeared to be an rifle in the area of West Sixth and Allen streets just before 7:30 p.m. Monday.

Police say officer tried to stop the boys but they ran away on foot.

The 10-year-old boy, who Waterloo Police are not naming due to his age, was stopped outside Irving Elementary School, 1115 W. Fifth St., and charged with carrying weapons and interference with official acts while carrying a firearm.

The 10-year-old was found to be carrying a Mossberg .22-caliber long rifle designed to look like an AR-15, according to Maj. Joe Leibold.

Police had previously told The Courier on Tuesday the rifle was a .22-caliber AR-15.

The boy is not being charged as an adult, and was released to his parents after being referred to juvenile court.

The other boys, ages 14 and 15, were not charged, police said.

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