An overnight fire damaged the main public library building in downtown Dallas.

Firefighters were called to the Erik Jonsson Central Library at 12:15 Sunday morning on a report of smoke inside the building.

Dallas Fire Rescue called in backup crews because of the size of the building.

The source of the smoke was a light fixture, which experienced an electrical short in a lower storage area of the library, according to Dallas Fire Rescue.

The fire was extinguished immediately after the sprinkler system activated, which limited the damage to the light fixture and the ceiling nearby, Dallas Fire Rescue said.

No one was injured.