Perth has been blanketed in a thick smoke haze, the result of a prescribed burn off in the city's eastern fringes.

Authorities issue a warning for possible ember attacks as an unseasonal bushfire burns at Herdsman Lake in suburban Perth.

An emergency warning for a fire that forced the evacuation of homes in Perth's south in the early hours of the morning has been downgraded, but residents have been told it is not yet safe to return to ...