Police are investigating a collision in Cwmbran.
It happened on New Street in Pontnewydd at around 4.05pm on Monday.
Officers attended, along with paramedics from the Welsh Ambulance Service, to assist with traffic management and the collision involved a car and a pedestrian.
A 64-year-old woman from the Cwmbran area is currently receiving treatment at the University Hospital of Wales in Cardiff after sustaining injuries to her back, head and legs.
Her condition is thought to be life threatening.
A Cwmbran man, 22, was arrested on suspicion of causing serious injury by dangerous driving and he was released under investigation as enquires continue.
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