HARTFORD, Conn. (WTNH) —Seven families were displaced after a fire broke out in a Hartford apartment complex Thursday morning, which police believe to be arson.

According to Hartford District Chief Mario Oquendo, Jr., the Hartford Fire Department responded to an occupied three-story, multi-unit brick apartment complex in the South End neighborhood just after 1 a.m. for a fire on the third floor.

A suspect was identified and detained on the scene, Hartford police said. The suspect lived in the third-floor apartment where the fire originated. Police believe the fire was due to arson.

Oquendo said that two people were in the stairwell and needed assistance getting out of the building. Both individuals were removed by fire personnel, and one of them was transported to the hospital for evaluation.

Oquendo said the fire was quickly knocked down and confined to the origin area.

The fire is currently under investigation by the Hartford Fire Marshal.

No firefighters were injured during the incident, Oquendo said.

The Hartford Fire Department’s Special Services Unit is working with the American Red Cross to assist seven displaced families, including 10 adults and five children.