10.50PM UPDATE: Two air ambulances have been dispatched to the area.
Four people are believed to be injured.

UPDATE: A tree is reported to have fallen on a car on the Black Spur.

EARLIER REPORT: Five emergency vehicles are responding to a rescue alert near Fernshaw. Emergency Victoria says the request for help came at 9.56am.

Earlier today, the Maroondah Hwy was blocked when a tree came down over both lanes.