The investigation into an early morning fire that caused an estimated $400,000 damage in Port Sydney continues.

The Huntsville/Lake of Bays Fire Dept responded shortly before 1:30 am on South Mary Lake Road.

When crews from Port Sydney Station 3 arrived, flames were visible through the roof.

Crews remained on scene for 5 hours, with assistance from Station 1, extinguishing hotspots.

The occupants were alerted to the blaze by working smoke alarms and managed to escape the home safely.

Unfortunately, two family pets perished in the fire.

Damage is estimated at $400,000.

The cause and circumstances are currently under investigation.

(Photo via The Huntsville/Lake of Bays Fire Department)