A cyclist has been flown to Southampton Hospital after being involved in an incident on St Saviour's Hill.
The 31-year-old man is in a serious, but stable, condition and is receiving further treatment in the UK.
Officers believe the man was cycling down the hill around 12:45 am, and officials say it was a 'single vehicle incident'.
The rider was wearing dark shorts, an orange jumper and white trainers.
The police would like to speak to anyone who saw him or who has dashcam or doorbell footage from 18 May.

Jersey's Health Insurance Fund 'not sustainable'
'Jersey must be stopped from sleepwalking into cashless economy'
Numerous entries from Jersey for the Guernsey Rally
Drivers reported for ignoring 'Road Closed' signs
Flood warnings in place for next 24 hours
Deputy Ozouf faces third suspension
Review highlights gaps, shortcomings and barriers to lifelong learning
Community arts programme given three year extension