A motorcyclist has been hurt in a crash on Gunthorpe Road in Peterborough this afternoon (Friday).
A Cambridgeshire spokesman said the incident only involved a motorcycle, and happened at 3.40pm.
A spokesman for The East of England Ambulance Service NHS Trust said: “An ambulance crew, rapid response vehicle, ambulance officer and Magpas Air Ambulance were dispatched.
“They treated a man who was not breathing and in cardiac arrest.
“Following treatment at the scene he was resuscitated and taken by land ambulance to Peterborough City Hospital in a critical condition.”
The road has been closed to allow emergency services to work at the scene.
Motorists are advised to avoid the area if possible.
UPDATE: The road has reopened as of 6.40pm.