One person has died after an accident at the entrance of the Brynglas Tunnels this morning.
Gwent Police say the driver, a 67-year-old man from the Cardiff area, was pronounced dead at the scene.
The accident involved one vehicle, which collided with a wall and an electrical sub-station.
Police say work to recover the vehicle and debris has now been completed and the Eastbound M4 has reopened but congestion remains very heavy in the area.
Anyone who may have witnessed the collision is asked to contact Gwent Police by dialling 101.
More top news
Conservatives begin their annual conference looking forward to the Assembly election campaign with UK election victory behind them
Thousands of people are taking to the roads of Cardiff to take part in the Cardiff Half Marathon 2015 today.
A Cwmbran woman refused funding for a life-prolonging cancer drug has started treatment thanks to the fundraising efforts of her neighbours.