Police are continuing to investigate the cause of a major house fire in Spearwood after a major emergency unfolded on Monday morning.

The alarm was raised around 6am as the blaze ripped through a home on the corner of the main artery of Phoenix Road.

Police locked down the scene and shut traffic off to a section of Phoenix Road until 11am, while the home was cordoned off with red and yellow tape.

Four fire units attended the blaze and left the scene just before 8am, while police remained onsite throughout the morning.

It’s the second fire at the property in the past week, with crews responding to a blaze in its rear shed sparked by lithium batteries on Monday last week.

The recent fire is understood to have started in an external sleep-out, with a neighbour at the rear of the property calling triple-0 while another went to the door to alert occupants.

It’s understood the home had no power at the time of the fire and a generator was being used for electricity.

Arson detectives are continuing to work to determine what sparked Monday’s fire, with officers seen assessing an outdoor gazebo that had been burned through.

An officer was also spotted removing an outdoor security camera.

Several distressed members of the public arrived at the scene shortly after the fire first broke out, joining a small gathering at the front of the house next door.