The fire is located amongst a large pile of mostly scrap metal.
The pile is approximately four meters high and 100 meters square in diameter.
The mattresses, where the fire is believed to have started were in the middle of that pile.
WorkSafe ACT and the EPA are also on scene.
ACT Fire & Rescue expect it will take up to several hours to fully extinguish the blaze
Firefighters are still working to extinguish the blaze which is inside a building in Lithgow Street.
ACT Fire & Rescue is working to extinguish a fire in Fyshwick.
Firefighters were alerted to the incident in Lithgow Street at 2.10pm and responded with two fire pumpers and a CAFS tanker.
The first fire crew to arrived a short time later to find a pile of mattresses well alight.
There is a large amount of smoke in the area and members of the public are advised to stay indoors in affected areas if possible.
The initial estimated damage bill is $30,000.
ACT fire & Rescue responded with three fire trucks, breathing apparatus support van, HAZMAT crew and a commander.
The neighbour rang Emergency Triple Zero (000) then quickly checked no one was inside the house.
Quick work by firefighters has prevented a kitchen fire spreading to other parts of a house in Holder.
Firefighters ACT Fire & Rescue was alerted to the incident in Foxall Place by a neighbour just before 1 o’clock this afternoon.
Fire crews arrived to find the fire had spread to the roof above the kitchen and extinguished it.
The fire is believed to have started after food was left cooking on the stove unattended.
Damage has been confined to the kitchen and roof directly above the stove area.
Firefighters are now ventilating smoke from the property.
ACT Fire & Rescue remind the community to ensure “you don’t stop looking while you’re cooking”.