UPDATE 9.15am

Traffic is now moving freely.  

UPDATE 7.25am

There is congestion to J28 Tredegar Park, with queuing traffic for 11 miles on M4 eastbound.

UPDATE 6.55am

A Gwent Police spokeswoman said that the crash involved three vehicles and that no injuries were reported.

She said that the lane has now re-opened. 

However, there is congetion to J25a Newport, with queuing traffic for seven miles.

6.40am

A CRASH on the M4 is causing slow traffic eastbound at J23a Magor services.

One lane is closed.