A cyclist in his 20s remains in a critical condition in hospital after a collision with a van on Thursday morning.
The crash happened on the Glenshane Road near Maghera at around 8:30am.
The driver of the Transit van was arrested on suspicion of causing grievous bodily injury by careless driving. He has since been released on bail, pending further enquiries.
Detectives are appealing for witnesses who were on the Glenshane Road between 8.10 and 8.30am on Thursday to contact them on 101, quoting reference number 225 for 16/11/17.