Fire crews arrived at the property to find the fire, located in the kitchen, had already been extinguished.
Firefighters are currently ventilating smoke from the home.
ACT Fire & Rescue is responding to reports of a house fire in Red Hill.
The alarm was raised about the fire in Cygnet Crescent at 9:55pm.
Update to follow.
Five people have possibly been exposed to the unknown substance but are showing no signs of ill health.
More than 100 people have been quarantined in the...