Authorities are investigating the cause of a fire that heavily damaged one of three buildings at a Bowling Green apartment complex Friday morning..

There were no injuries, but a Bowling Green firefighter was taken to the hospital for observation after apparently experiencing fatigue.

Twenty people in seven apartments were affected. An eighth apartment was vacant. The complex at 100 Creekside Drive on the west side of Bowling Green is owned and managed by the North East Community Action Corporation. NECAC was working with families to relocate families. The American Red Cross also provided disaster relief services.

The call came in at 4:48 a.m. Bowling Green Fire Chief Adam Mitalovich said the apartment building had major structural damage. Mutual aid was provided by fire departments from Louisiana, Buffalo Township, Curryville, Eolia, Clarksville, Frankford and Hannibal. The state fire marshal’s office is investigating

Apartment residents Alan and Edith Dameron were on the job at an Elsberry nursing home when the fire broke out and couldn’t immediately get to the scene. When they arrived, they found their apartment received water damage.

The structure was insured and will be demolished. NECAC has not made a decision about rebuilding. The other two apartment buildings at the site were not damaged and continue to house families.