Workers around 3:15 p.m. today pulled down the exterior wall of Baker High School's fire-gutted south wing so investigators safely could get into the building.
Investigators said the wall had been too unstable to risk going into the burned wing.
Fire Marshal Thomas Streeter, a 1982 Baker graduate, said the wing that burned had housed the school's ROTC class, wood shop, home economics, chemistry class, an armory and a school radio station, WBHS.
He said that wing was the only part of the school complex damaged by the fire, though other buildings have deteriorated or been vandalized.
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Deputy Chief Jerry Fountain said firefighters had two advantages in containing the fire to that building: No strong winds fanned the flames, and recent infrastructure improvements with development north of the school enabled the Columbus Water Works to increase water pressure to fire units battling the blaze.