Nearly 65 firefighter responded to the South Orange Avenue blaze at a vacant two-story commercial building around 8:57 p.m., Newark Public Safety Director Anthony F. Ambrose said.
The fire spread to another vacant building next door, he said.
One of the firefighters was taken to University Hospital for treatment of a minor head injury and released. The other two firefighters were treated at the scene by EMS and remained on duty.
No other injuries have been reported. The fire was considered under control just after 1:15 a.m.
The cause and origin of the fire is under investigation by the Newark Fire Division’s Arson Unit.
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