A man has been arrested and another remains in critical condition following a motorcycle crash on Pontygwindy Road, Caerphilly town.
Police were called at around 7.40pm on Wednesday, September 11.
A 47-year-old man, from Llanishen, was arrested on suspicion of causing serious injury by dangerous driving, driving without insurance, driving otherwise in accordance with a licence and failing to stop following a road traffic collision.
He has since been released under investigation and police say enquiries are still ongoing.
The passenger of the motorbike was taken to hospital with serious injuries.
A woman, the driver of the car involved, was also taken to hospital as a precaution.
The motorbike rider fled the scene after the incident.
Anyone has information about the crash can call Gwent Police on 101 quoting Log 491 11/9/19.