An emergency warning has been issued for a bushfire burning on Sydney’s upper north shore.

The blaze is at Canoon Road at South Turramurra.

The Rural Fire Service says the Canoon Road bushfire is spreading quickly and properties are under threat.

“It is too late to leave,” the RFS said in its warning message on Tuesday afternoon.

“Seek shelter as the fire approaches. Protect yourself from the heat of the fire.”