*UPDATE 11.42AM*
The lane is re-opened.
A spokeswoman for Gwent Police confirmed: "At approximately 9am on Thursday, March 7, Gwent Police were called to a two vehicle road traffic collision on the M4 between Junctions 28 and 29.
"No serious injuries have been reported.
"Wales Traffic officers dealt with it."
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THERE is some traffic on the motorway believed to be caused by a minor accident.
One lane is blocked on the M4 Westbound from J27 B4591 Glasllwch Crescent (Highcross) to J28 A48 (Tredegar Park), causing a traffic build-up.
This is reportedly due to a car hitting the central reservation, although this is not yet confirmed.
Gwent Police have been contacted for information.
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