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:
“At the moment [we are] there to balance the competing rights of the protestors with that of the motorists, and our aim is to ensure that the protest passes in a safe and peaceful way and everybody stays safe”.
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.
Just saw about 4 riot vans, 5 police cars, 1 police motorbike & 1 traffic control car set off down the Severn bridge, loads of police about.
"Our priority is the safety of those involved and motorists and also to ensure the free flow of traffic. We have adequate resources together with our partners to ensure all eventualities are dealt with appropriately.”
Hundreds of people have gathered outside the Senedd in Cardiff Bay to protest about so called 'fracking'.
The controversial method of extracting oil or gas from rock. Today's protest was part of a worldwide campaign which wants to ban the process.
Nicola Hendy reports.
An anti-fracking demonstration is taking place outside of the Senedd, as part of co-ordinated anti-fracking protests around the world.
Environmental groups Friends of the Earth Cymru and Frack Free Wales are organising the event.
In a statement, a Welsh Government spokesperson said:
"We are committed to ensuring that the economy and people of Wales benefit from energy developments. The evidence currently available is insufficient to determine whether gas from hydrocarbons in Wales can contribute to the future energy mix and provide benefits to the people of Wales. This will only be determined through further exploration and research."
Gareth Bale paid tribute to last night's fans for turning out in Cardiff and showing their support following Wales' 0-0 draw against Bosnia.
The Real Madrid star added the team are now looking forward to Monday night's game against Cyprus.
Wales manager Chris Coleman also spoke to ITV News and praised his side for their performance last night.
An anti-fracking demonstration is to take place outside the Senedd later as part of co-ordinated anti-fracking protests around the world.
Environmental groups Friends of the Earth Cymru and Frack Free Wales are organising the event in the Welsh capital, which will get underway from midday.