Northwood house fire: Eerie CCTV reveals moment $24m waterfront mansion bursts into flames

New security footage shows the moment a $24million Sydney mansion caught fire earlier this month.

The Northwood house in Sydney’s Lower North Shore was destroyed by fire just after 11pm on Saturday September 3.

Now NSW Police have released CCTV footage of a man walking towards the house moments before it was set on fire, hoping the public can help with their investigation.

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WATCH THE VIDEO ABOVE: CCTV shows the moment the Sydney Mansion goes up in flames.

“As investigations continue, strike force investigators have released CCTV footage of a man who they believe may be able to assist them in their investigations,” they said in a statement.

“The man, dressed in dark clothing, can be seen on Cliff Road shortly before and after the fire started.”

No one was home at the time and no injuries were reported.

New security video has been released showing the moment a historic mansion caught fire on Sydney’s Lower North Shore. Credit: New South Wales Police
Firefighters were called to the property on Saturday evening to find it completely on fire. Credit: 7NEWS

Firefighters say they were faced with a massive blaze, with some flames reaching heights of 20m, according to Jim Murphy of Fire and Rescue NSW.

He said “very strong winds” were blowing embers, threatening nearby homes.

Police suspect the fire, which destroyed the house, may be arson.

“At the time, we realized we couldn’t save the house that was on fire,” Murphy told Weekend Sunrise.

“Firefighters were worried about nearby properties so they immediately got to work and protected those properties, while our two teams carried out a very quick search to see if anyone might have been inside.”

It took over an hour for more than 50 firefighters to bring the blaze under control.

The house before the Northwood fire. Credit: White Ray
The remains of the building on Sunday morning. Credit: 7NEWS

The six-bedroom house on Cliff Road – which also included four bathrooms, a wine cellar and a library – sold for $24.1million last November, according to online data.

The cause of the fire is under investigation.

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