One person suffered minor burns following a fire at an apartment building in downtown Charleston early Sunday.

A total of 12 people were displaced as a result of the blaze. Firefighters were called to the three-story apartment building at 124 Beaufain St. near Gadsden Street at 3:35 a.m. Sunday where they found the building partially engulfed in flames.

Fire Marshal Mike Julazadeh said fire spread to all three floors of the structure. The roof of the building along with a section of the north side of the structure collapsed due to the blaze, Julazadeh said.

Residents were evacuated from the building before the collapse. One resident suffered minor burns to his face but all other residents were uninjured, Julazadeh said.

Firefighters spent much of Sunday extinguishing hot spots from the rear of the home on Wentworth Street where the structure's collapse created concealed pockets of fire. Julazadeh said firefighters were ordered to remain at the building overnight Sunday to monitor the site for smoldering flames.

The American Red Cross Palmetto chapter reported assisting 11 people who lived in the apartment building. Another seven people in adjacent residences were also assisted due to lost electrical power, Red Cross officials said.

The origin and cause of the blaze is under investigation.