Authorities suspect two fires that started on Tuesday in Turramurra on Sydney’s north shore were an act of arson.

Shane Fitzsimmons from NSW Rural Fire Service said they are treating the fire as suspicious and have declared the area a crime scene. 

Mr Fitzsimmons said the fire is a heinous crime and the perpetrators deserve to have the whole weight of the law against them. 

“You can spend a long time in jail for lighting fires at any time, let alone on a total fire ban day under some of what can only be described as the worst possible conditions forecast in a highlight populated area like Sydney,” said Mr Fitzsimmons.