Northland High School was placed on lockdown Tuesday morning after reports of a gunshot in the area.
The lockdown was lifted at about 9:30 a.m.
An administrator reported hearing a gunshot on his way to work Tuesday morning.
That worker called police, who placed the school on lockdown around 7:30 a.m.
Columbus Police said one student reported hearing a young man threatening to shut down the school, then firing a shot into the air outside the building.
Police said that the male, who is no older than 18, has not been located.
Officers set up a 1-mile perimeter around the school to search for that suspect.
Students were asked to stay inside the building during the search.
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