TWO lanes are blocked on the M4 and there are reported tailbacks of four miles following an accident on the M4 involving four cars.
Police were called to the incident at junction 24 at 5.30pm.
A Gwent police spokesman said no-one was injured in the incident.
South Wales Fire and Rescue Service was not called to the scene.
Both lanes are currently blocked by the accident, which is located between the slip roads, and there is congestion to junction 23a.
All traffic is using the hard shoulder to bypass the scene.
Police remain at the scene.