UPDATE: 10.50am: The woman is in a serious but stable condition.
Police are appealing for witnesses. Call the Witness Collison Hotline on 01522 558855.
UPDATE: 10am: The woman has been freed and taken to Lincoln County Hospital.
A pedestrian is trapped underneath an articulated lorry in Lincoln's High Street.
It is thought the lorry, which belongs to Danish transport company DSV, was turning into St Mark Street when it happened.
Emergency services are on the scene to free the casualty which is thought to be a female who was on a bicycle.
An eyewitness told the Echo: "She was going across the road on her bike at the crossing and the lorry was there. I heard it screech and heard her scream. I knew she had been hit when I heard the scream.
"She did not look bloody and was put in the recovery position straight away and was talking."