Sydney luxury apartment block engulfed in huge fire

AAP

Fire crews have spent the night fighting a huge blaze at a multi-storey apartment building in southwest Sydney, which has now been contained.

Crews were called to the under-construction luxury apartment block on Shepherd Street at Liverpool just before 8.30pm on Thursday to find the upper levels well alight.

About 70 firefighters worked through the night to extinguish the blaze, with investigators working to determine if the fire was deliberately lit.

The site has since been declared a crime scene as police probe how the fire began.

A unit block in Sydney has been engulfed in a huge blaze overnight. Photo: 7 News

The blaze broke out on the 16th floor before quickly engulfing more levels.

Spectators watched on in shock concerned that lives would be lost.

"I think there's people in there," one person can be heard saying in video footage of the fire.

"That's a massive fire, it's huge."

No one was injured in the fire because the building was still under construction and no one was living there.

A building that was still under construction caught fire in Liverpool overnight. Photo: 7 News

The massive blaze has since been put out. Photo: 7 News

Firefighters entered the building with flashlights to make sure no one was inside and dozens worked through the night to contain the blaze.

The fire crews reportedly had trouble getting water to the apartment because piping hadn't been installed yet.

Embers fell from the inferno, raising the danger of spot fires on the ground.

No firefighters were hurt fighting the blaze.

Newsbreak - September 8