A Watch and Act has been issued for a part of Sydney’s north-west after a grass fire broke out.

The blaze is burning out of control near Fire Trail Rd, Castlereagh.

The fire is burning in a south-east direction towards Nutt Rd.

Winds are gusting at about 40 kilometres an hour, and temperatures are in the 30s.

Firefighter crews are responding and water-bombing aircraft are working in the area.

Residents are now being told to seek immediate shelter as the blaze is burning at an emergency level.

Nine News reporter Zara James tells Karl Stefanovic the blaze has now entered the gardens of some properties.

“It’s really taken a real sudden turn here.

“The fire has really flared up, it’s come very close to the side of the road and in some areas it has actually crossed the road.”

Click PLAY below to hear the full interview

Rural Fire Service Commissioner Shane Fitzsimmons says firefighters are desperately backburning around the fire.

“We’ve still got more than 50 firefighters working on that fire.

“The threat’s been downgraded on that but it’s still a very active fireground.”

Click PLAY below to hear the full interview

Image: NSW RFS