Fire crews say they are “beginning to gain the upper hand” on a fire burning at emergency-level in Sydney’s southwest – as a second fire escalates nearby.

At least 80 firefighters are tackling the fire, which is burning along Camden Valley Way near Horningsea Park and Edmondson Park in Liverpool.

The fire is becoming contained to the western side of Winburg Drive and Diamond Hill Circut in Edmonson Park, the RFS said.

The grassfire is burning at an emergency level along Camden Valley Way in Liverpool, heading towards Edmonson Park. (Nine)

However, residents are still in danger and should seek shelter immediately, officials warned.

The fire started at the intersection of Camden Valley Way and Cowpasture Road just before 2pm, and quickly spread towards homes

The fire has already swallowed up a fairground, burning through equipment, including a teacup ride according to video footage. (Nine)

It is too late for residents in Talarna Hill Drive to Jardine Drive to leave, the RFS said.

Camden Valley Way and Bringelly Road are now closed between Corfield Road at Prestons and Cowpasture Road at Leppington.

Motorists are advised to avoid the area and use an alternative route and are being warned smoke could affect visibility.

Trains are not running between Glenfield and Leppington on the T2 Inner West & Leppington Line.

Replacement buses have been organised, but are not yet on site. 

Embers will be blown long distances away from the main fire, the RFS warned.

Waterbombing aircraft are trying and slow the spread of the fire.

A grassfire has started between Campbelltown and Liverpool in Sydney’s south-west. (Nine)

The fire has already swallowed up a fairground, burning through equipment, including a teacup ride according to video footage.

Meanwhile, a second fire is burning out of control near Richardson Road in Spring Farm near Camden.

It is at a Watch and Act level. 

There are also three more fires burning at advice level nearby, at Bringelly Road in Leppington, and Campbelltown Road in Bardia.

Another one is burning at advice level at Canterbury Rd, Bankstown.

Temperatures in Sydney this afternoon hit 28C amid a late winter heatwave.

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