CHICAGO (WLS) -- One person was killed and another seriously injured in a Northwest Side house fire, officials said.



Smoke and flames were mainly concentrated in the lower half of the home, located in the 6000-block of W. Nelson, but quickly traveled through the three levels of living space early Sunday morning, fire officials said.



A 26-year-old woman, whose identity has not been released, was pronounced dead at the scene. Another person was hospitalized in critical condition.



The blaze also caused evacuations of nearby neighbors.



"All of a sudden we heard some knocking on the door and police were right there and said, 'Get out of the house, there's a fire next door,'" said James Jahnke, a neighbor. "So me, my wife and my stepson evacuated the house, we all came outside, got my dog."



The fire has been extinguished, but officials are investigating its cause.



