Opponents of the Corrib gas pipe line in Co Mayo have clashed with security staff employed by contractors working on the project.
The protest took place at Glengad where the pipeline from the off shore gas field is to be brought ashore.
There were a series of scuffles as local residents tried to stop construction work at the site.
The resident's organisation Pobal Chill Chomian called on the Green minister's for the Environment and communications John Gormley and Eamon Ryan to order the work to be halted until rigorous geologic survey and examination is completed.
In a statement Shell E&P Ireland Limited said the protest had a minimal impact on the work schedule and the company had obtained all necessary permits and consents for the work.
It added that the site excavation works at Glengad are being witnessed by staff from the National Parks and Wildlife Service.
Gardaí, who were at the scene, made no arrests. Yesterday 12 people were arrested and subsequently released.
