Organisers of a motorcycle race on the Isle of Man are investigating why five competitors died in this year's event.
The races are held on tight public roads and rank among the most dangerous in motorsport, with 265 deaths.
TT Formula One motorcycle champion Graeme Crosby says competitors enter these events with confidence in their ability to race well.
But, he says, the Isle of Man circuit doesn't take any prisoners.
He spoke to Susie Ferguson.
