The incident happened on London Road at around 2.25pm today (September 14).Â
Police confirmed that a car and a pedestrian were involved in a collision and that the car,Â a Honda Insight, did not stop at the scene but has since been located.
A Portsmouth man has since been arrested in connection with the incident and remains in police custody at this time.Â
Sue Taylor, Â who works at Portsmouth Laundry, said: '˜I heard an almighty bang. I was out the back.
'˜The lady looked in a pretty bad way.
'˜It is not what you would expect on a Friday afternoon.
'˜It's really shook me.Â The noise I heard it wasn'tÂ a nice sound.'Â
London Road was partly closed for several hours this afternoon but has since reopened and the police cordon removed.Â