The blaze broke out before 8:30 a.m. Monday in the 300 block of North Sycamore Avenue.
Video from Chopper 6 HD showed flames and thick smoke coming from the roof of one section of the three-story complex.
More than a dozen residents were seen standing outside a number of adjacent units.
Police tell Action News two people, a teenager and an adult, were hurt escaping the fire.
Their injuries were described as non-life-threatening.
In addition, two firefighters were treated for injuries also described as non-life-threatening.
Action News is told two children were dropped from windows into the arms of rescuers on the scene.
Neither child was hurt.
Fire officials believe the fire was sparked by a young child playing with a lighter found underneath a bed in one of the units.
A full investigation continues.
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