A male cyclist has been taken to hospital for treatment to serious injuries after he was struck by a car on the Glenside Road, Dunmurry on Sunday morning.
The collision was reported to police shortly before 8.30am.
The 23-year-old driver of the car has been arrested on suspicion of a number of driving offences.
Police are appealing for witnesses and can be contacted on 101, quoting reference number 485 14/10/18.
The Glenside Road remains closed.