Gwent Police confirm they have arrested a 22-year-old woman from Newbridge on suspicion of perverting the course of justice.
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Police are appealing for information after a pensioner was hospitalised with serious life threatening injuries after a collision with a car.
A crash on the M4 eastbound near Margam is causing miles of tailbacks.
The woman had just withdrawn money from a cashpoint on Oxford Street when a man who had been watching her snatched it and ran off.