The man who died is thought to be in his early 50s.
The other man, reportedly in his 20s, suffered spinal and leg injuries and was taken to Addenbrooke's Hospital in Cambridge.
An investigation into the accident is underway.
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The NSPCC believes there are a number of reasons why there has been a dramatic increase in recorded child sex offences.
Armed police have carried out a raid apparently linked to Wednesday's deadly terror attack in Westminster.
Six addresses have been searched as part of police investigations so far and seven arrests have been made.