Conditions across the fire ground have begun to ease, as firefighters and aircraft have started to gain the upper hand.

NSW Rural Fire Service raised urgent alarms yesterday in regards to an uncontrollable bushfire on Sydney's Northern Beaches.

An out-of-control fire is burning near Oxford Falls in Sydney's north. Firefighters are at the scene trying to control the blaze, which is burning east towards Cromer Heights.

Residents near a bushfire on Sydney's Northern Beaches are being told to monitor conditions. Photo: NSW RFS A fire behind properties on Sydney’s Northern Beaches has been downgraded. Firefighters backburned overnight Saturday as conditions that fanned a large bushfire eased.

A fire is burning out of control in Sydney's north, with residents and a nearby aged care warned to prepare to act.

The Rural Fire Service has lowered the alert level for the blaze which began as a hazard reduction burn in Oxford Falls.

Residents are being urgently evacuated from Sydney's Northern Beaches as firefighters battle an out-of-control hazard reduction burn.