Burned land is seen as gray-brown in this satellite image taken of Grampians National Park in Victoria by Landsat 8 satellite on January 19, 2014 in this handout image released by NASA on January 24, 2014. Active fires can be seen to the right of the image, sending up plumes of smoke. One person died in the Grampians bushland in the southeastern state of Victoria, about 300 km (186 miles) west of Melbourne, where bushfires were burning out of control amid temperatures which have hit above 40 degrees Celsius , destroying or damaging houses. [Photo/Agencies]

SYDNEY - A bushfire in Perth's City of Swan in Western Australia has been brought under control, the state fire authority said on Friday.

The Department of Fire and Emergency Services (DFES) said 45 firefighters are on the scene strengthening containment lines.

Aerial support has been sent to assist ground crews, it added.

At 6:35 am (local time) on Friday, a watch and act alert was issued for people in the southern part of Aveley in Swan as there was a possible threat to lives and homes.

But the alert for the southern part of Aveley were downgraded to a bushfire advice at 7:45 am on Friday while people in the northern part of Aveley were given the all clear.

There has been a string of suspicious bushfires in the area in recent days, including one at Ellenbrook, where flames came within meters of dozens of homes.

On Friday, the DFES confirmed a bushfire that threatened lives and homes in the town of Kwinana in Perth's outer southern suburbs on Thursday afternoon was deliberately lit.

More than 70 firefighter tackled the blaze and brought the fire under control overnight.