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

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

Fire crews work overnight as bushfire burns through 100 hectares of land across Sydney’s north. A WA detective is recovering in hospital tonight, after being ‘hit and run down' by a car during a police operation in Perth’s eastern suburbs.

The bushfire emergency on Sydney’s northern beaches was downgraded late on Saturday afternoon, as firefighters gained control of the large blaze with no property losses reported. But residents of Cromer Heights were warned to stay alert for possible flare-ups.

A fire burning near Oxford Falls in Sydney's north that was considered out of control earlier today has been downgraded from Emergency to Advice.