SIOUX FALLS, S.D. (AP) — Three people received medical treatment after a small fire in a mixed-used building in Sioux Falls.

The fire department says two people were treated by paramedics at the scene for smoke inhalation and a third was taken to a hospital with unspecified injuries after the fire shortly before 12:30 a.m. Thursday.

Firefighters who responded to the scene used a letter to rescue people who were hanging out of a second-floor window. Inside, firefighters found a small fire in a stairwell between the second and third floors.

It was extinguished within 10 minutes and the building was ventilated to remove smoke. The cause of the fire wasn't immediately determined.