The fire broke out at 9:30 p.m. Monday at the Surrey Carlton Apartments just off Ewing Avenue in Spring Valley.
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It rekindled overnight, and NewsCopter 7 was overhead early Tuesday morning after crews had to douse the flames again.
Two people were hurt in the fire, including a firefighter who was struck by falling debris and a woman who was found unconscious and rescued by residents.
The injuries to both were said to be non-life-threatening.
The fire caused heavy damage to at least 20 residences.
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Fire investigators were working to determine the cause.
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