Five people have been arrested for trespass in the Swansea Valley in a protest against a gas pipeline that will span the breadth of Wales.
The pipeline will run from Pembrokeshire to Gloucestershire
South Wales Police said the two men and three women from the Bristol and Sheffield areas were being questioned.
They were held after allegedly going on to private land at Trebanos, where construction work is taking place.
The village has seen several protests, with activists occupying a section of pipe for over a week late last year.
The 200 mile (322km) pipe will carry natural gas from two liquefied natural gas (LNG) terminals in Pembrokeshire to join up with the main UK network in Gloucestershire.
Supt Cliff Filer of South Wales Police said officers had been monitoring the protests in the Trebanos area for a number of months.
He said police had to "strike a balance" between the rights of protesters and the ability of the contractors to built the pipeline without interference.
"We have repeatedly warned the protesters that they have rights and responsibilities to ensure the interests of both parties are protected," he said.
"However, due to the persistent trespassing on the land and the strategic importance of the pipeline, we have arrested five protesters on the site.
"It is a criminal offence to enter private land and prevent a business conducting its lawful business."