Crews say five people evacuated the two-unit apartment complex at Terrace and Bond at around 11 p.m.
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The residents told firefighters the fire started when a mobile heat in the home malfunctions. Investigators say crews were met with heavy flames in the home, which is not typical for a heater fire.
Firefighters saved one of the apartment units, but the other was severely damaged.
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Fire investigators haven't determined the cost of the damage or how many people lived in the duplex.