CEDAR RAPIDS, Iowa (AP) — Fire investigators say a fire that threatened residents of a Cedar Rapids apartment was intentionally set. The Cedar Rapids Fire Department says in a statement that the fire early Wednesday morning was started when someone poured flammable liquid in the stairwell between the first and second floors of the three-story building and lit it.

The fire trapped several residents on the upper floors. Two people were rescued from the third floor by police officers using a ladder. Two other people jumped from upper floor windows onto cushions set up by firefighters. Three people were taken to a hospital for minor injuries.

Officials say the fire was relegated mainly to the stairwell, but there was smoke damage throughout the building. Authorities are asking the public for any information about the fire.