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PHILADELPHIA (AP) _ A 10-year-old boy was grazed in the right cheek by a bullet when an off-duty police officer conducting a school demonstration dropped her gun Wednesday, officials said.

The boy was released after treatment at Temple University Children's Medical Center, hospital spokeswoman Jennifer McGowan said.

The officer had shown the magazine clip to the class at Imani Education Circle Charter School and had just put it back in the gun when she dropped the weapon, Principal Francine Fulton said.

Police department spokesman Sgt. Roland Lee declined to name the officer who joined the department in 1996. Her child was among the 23 students in the class at the time, he said.