Green MP Caroline Lucas was among those arrested at a sit-in aimed at halting plans to drill for shale gas in a West Sussex village.
As campaigners in Balcombe begin a five-day camp in protest at fracking, supporter Tisha Brown tells ITV News why it's such a crucial issue.
The chief executive of Cuadrilla Resources, Francis Egan, told ITV News the company "will complete our approved work" at its Balcombe site.
Campaigners are expected to begin a second day of direct action against fracking.
Green Party MP Caroline Lucas was among more than 30 people arrested when anti-fracking campaigners staged a series of protests around the country on Monday.
The arrests were made as hundreds of people gathered outside the gates of energy firm Cuadrilla's drilling site in Balcombe, West Sussex.
Opponents of the controversial process for extracting shale gas also blockaded the headquarters of Cuadrilla, while others superglued themselves to a PR company used by the energy firm.
A total of 29 people were arrested at the anti-fracking demonstration in Balcombe, West Sussex today, Sussex Police have said.
Most were arrested on suspicion of breaching Section 14 of the Criminal Justice and Public Order Act for ignoring directions to leave, or obstructing a highway, or both.
Sussex Police have said they are looking into reports that one of its officers was not wearing an epaulette displaying their identification number at the protests in Balcombe today.
The force said a video appears to show the epaulette coming loose as though it had been knocked off or pulled off.
Sussex Police state in their Uniform and Appearance Standards Policy that uniformed officers must "ensure that their epaulettes and / or their warrant card are displayed at all times when on duty".
The epaulettes are deliberately removable to they can be clipped onto a clean uniform.
Sussex Police have been explaining some of their methods to move protesters at the anti-fracking demonstration in Balcombe, including the use of pressure points.
Using pressure points to move protestors is recognised nationally as one of the safest options where people suffer a momentary discomfort.
We would rather talk to people and persuade them to move than to have to resort to force and make arrests.
We understand that 3 officers arresting one person may look excessive - but this is to ensure that control is achieved with minimum force
Police moved in to arrest some 30 protesters at demonstrations against fracking in the West Sussex village of Balcombe today.
Whilst the sit-in on a road near the test drilling site appeared peaceful, police said they had no choice but to arrest activists who refused to move.
Among those in police detention tonight was Green party MP Caroline Lucas who described the protest as a last resort.
ITV News correspondent Juliet Bremner reports from Balcombe:
Police say they have arrested about 30 protesters in Balcombe today and have taken them to a number of different police stations across Sussex.
There were no further details of charges.
Sussex Police Superintendent Lawrence Hobbs told ITV News that he had no choice but to arrest those who would not go peacefully.
Police said around 25 protesters had been arrested at the anti-fracking demonstration in Balcombe by around 3.30pm.
Sussex Police said officers had earlier removed a number of bicycles that had been locked together and left lying across the road, which they said created a "serious safety hazard".
Sussex Police said more than 400 officers have been deployed on the operation at Balcombe, with support from 10 other UK forces.
Police are trying to remove a pipe that is connecting the remaining few activists at an anti-fracking demonstration in the West Sussex village of Balcombe.
Green MP Caroline Lucas was applauded by fellow anti-fracking demonstrators as she was led away by police.