Protestors are pictured holding flags and waving placards as they demonstrated on the M4 Severn Bridge crossing this afternoon.
There was a heavy police presence as officers from Gwent Police attempted to escort the protestors, believed to be demonstrating over the treatment of Iraqi Kurds by ISIS, off the main carriageway.
Gwent Police say they believe the protest is over treatment of the Iraqi Kurds at the hands of ISIS.
Traffic has begun moving slowly as police attempt to escort the protestors to the M4 tolls and off the main carriageway.
These pictures show protestors hanging out of their cards as they travel along the M4 after holding a demonstration on the westbound Severn Bridge.
The protest on the M4 Severn Bridge is causing delays on the M48 Severn Bridge too, as motorists try to get back into Wales.
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Police say they're currently working with organisers and protestors who they estimate arrived in around ten vehicles to protest on the M4 Severn Crossing.
Gwent Police have told ITV News that they are trying to balance the rights of the protestors with that of the motorists as they deal with an ongoing demonstration westbound on the Severn Bridge:
There is traffic disruption on the M4 this afternoon due to a number of demonstrators protesting in the middle lane westbound of the Severn Crossing.
Gwent Police say officers are engaging with them to establish what their plans are.