It happened in Dorset Avenue last night when the victim was walking along the pavement with a friend.
They were both hit by a dark-coloured car.
One of the men was then stabbed in his lower body and is in a serious condition in hospital.
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Outbreaks of rain clear this evening, with a bright and dry day tomorrow turning wet and windy.
A seventh person has been arrested after the murder of a17-year-old in Northampton.
It will be damp and breezy with rain on and off through the day.