The A420 at Littleworth near Faringdon is currently closed in both directions between the Barcote Lane junction and the London Street junction due to fallen power cables.
Police were called to the scene at 6pm after reports of a large green cable across the road.
They have since confirmed that one section of cable has become dislodged from an overhead power line.
Engineers from Southern Electric are at the scene fixing the problem, but houses in the surrounding area are experiencing power cuts.
The road is expected to remain closed for the next four hours.
- For automatic updates see our Live Traffic Service
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