A worker has been trapped in an excavator after a building collapsed on top of them at a demolition site in Sydney’s Inner West.

The 10-storey building fell onto the excavator just after 3pm today at the site on Railway Parade in Burwood.

It’s understood the structure became unstable during the demolition process, causing the building to fall.

The 10-storey building fell onto the excavator just after 3pm today at the site on Railway Parade in Burwood.
The 10-storey building fell onto the excavator just after 3pm today at the site on Railway Parade in Burwood. (Nine)

A rescue operation is underway to free a labourer trapped inside the excavator.

Their condition is unknown.

“We have specialist recuse crews attending including our heavy rescue,” Fire and Rescue NSW Acting Superintendent Mat Sigmund said.

“We are assessing the situation and engaging engineers and experts… It will be an ongoing incident.”

Fire and Rescue NSW and NSW Police are on site.

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