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By Erik Ortiz

Ohio corrections officials are investigating how a high-flying drone dropped a drug-filled delivery into a prison yard last week — setting off a brawl among several inmates.

At least nine prisoners at the Mansfield Correctional Institution, a men's facility southwest of Cleveland, were involved in the fight on July 27 and placed in solitary confinement, according to an incident report.

"Upon reviewing the cameras, it was determined that a drone passed over the recreation yards immediately before the fight began," the report said.

Related: First FAA-Approved Drone Delivery Drops Medicine in Virginia

The delivery included almost a quarter of an ounce of heroin, more than 2 ounces of marijuana and more than 5 ounces of tobacco, prison officials said.

The package was initially dropped into a recreation yard and picked up by an inmate for whom it was not intended, causing a fight around 2:35 p.m.

Corrections officers used pepper spray to subdue the inmates, and about 200 prisoners were then ordered into a gym and strip-searched for any contraband.

There were no reported injuries. The investigation into the incident is ongoing, officials said Wednesday.