Twelve arrested during M4 fuel protest for driving slower than 30mph
Gwent Police warned protesters that it was aware of "driving offences" being committed during the fuel protest.
Gwent Police warned protesters that it was aware of "driving offences" being committed during the fuel protest.
Police have warned of "serious disruption throughout the day" as protesters target motorways in a demonstration over high fuel prices.
Both the M4 and M48 bridges are expected to be blocked.