Firefighters are investigating the cause of a three-alarm fire in McCully Saturday morning that left $500,000 in damage and displaced 11 people.

A total of 13 fire companies and 42 firefighters responded to the fire at 2323 Lime St. at 8:18 a.m.

The two-story structure and another structure behind it were both “fully involved” when firefighters arrived, said Capt. James Todd of the Honolulu Fire Department.

A single-story cottage nearby was partially damaged from radiated heat, Todd said.

A firefighter was injured after a ceramic tile dislodged from the second floor roof and fell on his helmet. He was taken to the Queens Medical Center and has been released, Todd said.

The fire was under control at 9:37 a.m.

Five women and six men were displaced from the fire. No occupants were injured.