Emergency services are responding to a serious crash in the Trossachs.
The horror incident which happened just north of Balfron has led to the closure of both carriageways of the A81.
An air ambulance has been deployed to the incident that involved at least two motorbikes and one car.
The happened around 3.40pm this afternoon but emergency services remain at the scene.
A Police Scotland spokesman said: “We were called around 3.40pm to a report of a crash involving two motorbikes on the A81 near Balfron Station.
“The Scottish Ambulance Service is in attendance and the road is currently closed."
Earlier this year a cyclist was found unconscious on the same stretch of road after being struck by a car in a hit-and-run.
Police said the male cyclist was hit head-on by a black Range Rover which had been overtaking another vehicle on a blind bend on the A81 near Balfron Station.
