ST. LOUIS (AP) — Three people are recovering from injuries following a fire at an apartment building in north St. Louis.

The fire broke out just after 1 a.m. Thursday on the second floor of a three-story building. KTVI-TV (http://bit.ly/1jByXrD ) reports that three people were treated for smoke inhalation and more than 100 were evacuated.

The damage was contained to a single unit and residents have been allowed to return.

The cause of the fire remains under investigation.

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Information from: KTVI-TV, http://www.fox2now.com/