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(KSL News) A fire that forced five people out of their home is still smouldering this morning.
Fire investigators don't know how it started, but they do know why it spread so quickly.
![Fire Forces Residents From Home in Ogden](https://img.ksl.com/slc/54/5455/545584.jpg?filter=kslv2/inline_lg)
Brandon Thueson, Deputy Fire Marshall, Ogden City Fire Dept: "The way they constructed in that time period. There're openings in the walls from basically the basement to the attic. Just provides a fast area for the fire to spread through."
Neighboring homes had to be evacuated.
All five residents made it out of the house safely and are with family this morning.