Two cyclists taking part in the 100-mile Ride London-Surrey event have been airlifted to hospital after two separate crashes.
One man is in a serious condition after hitting a tree and another is being treated for a serious head injury after falling off his bike.
Many of the riders taking part in the annual event were held up for prolonged periods before being diverted after the first crash in Surrey this morning.
The man was taken by air ambulance to St George's Hospital in Tooting, London.
The second crash took place at around 10.55am near Thames Ditton and he was also treated by air ambulance paramedics before being taken to a London hospital.