A multi-level fire broken out in Sydney's Surry Hills and dozens were evacuated from the building.
The fire started at 4pm on Thursday, with eight fire crews quickly turning to 20 in a matter of minutes as the building burned furiously.
Over 50 people were evacuated from surrounding buildings as the blaze burned on.
Firefighters have succeeded in extinguishing the blaze, but several roads remain closed as two walls are still at risk of imminent collapse, potentially hurling tonnes of bricks onto the streets below.
Debris has piled up on Randle Street, destroying a vehicle, as bricks flew from the collapsing building.
Emergency services remain on the scene today as engineering teams begin conducting safety assessments. Police say two 13-year-olds handed themselves in at police stations late on Thursday night, as police call on other teens to come forward.
Neighbouring office workers watched in horror as the abandoned factory burned.
Fire and Rescue NSW crews worked throughout the night to extinguish the massive inferno.
Bright orange flames lept from the blaze which engulfed two buildings in Surry Hills.
The blaze tore through the building, causing a wall to collapse.
Glowing smoke poured out of the building, covering the nearby lane-ways in a grey haze.
The NSW Police and the state's fire and rescue service cornered off every street as crowds gathered to watch the building burn.
NSW Police and the state's Fire and Rescue service have warned people to stay away given the danger from falling debris and smoke.
"Firefighters are currently on scene at a large multi-story building fire," Fire and Rescue NSW said.
"Please avoid the area."
The fire broke out just after 4pm, according to Fire and Rescue NSW.
Over 100 firefighters and 20 fire crews worked to put out the blaze.
Here you can see the bones of the building aglow with orange flames.
The building sits right next to central station.
Light rail services on the L2 Randwick and L3 Kingsford lines have been suspended due to the blaze.
"Services are not running between Circular Quay and Moore Park due to a building fire," an alert on the official TripView app says.
Train services were running at the time of publication.
Firefighters and police stopped spectators getting too close as the building started to collapse.
"The building is starting to collapse, while the inferno is beginning to spread to several neighbouring buildings, including residential apartments," Fire and Rescue NSW confirmed.
"At least one vehicle in the vicinity has also been destroyed by fire."
Thick black smoke billowed from the building.
A 9News helicopter captured this angle of the building.
The windows have been blown out and debris surrounds the structure, which still glows from inside.
You can see the ferocity of the fire and how significant the damage inside the building is in this photograh.
Firefighters do not know what caused the blaze yet.
There has been some damage to surrounding buildings.