Protesters at the Kepak meat factory in Athleague Co Roscommon have blockaded a truck leaving the factory.
RTÉ News reports they obtained video footage that shows some protesters with their heads and faces covered, while one person is seen wearing a balaclava.
The incident occurred this morning as three refrigerated lorries were leaving the facility.
Protesters stopped the third lorry leaving the plant.
Gardaí arrived at the scene earlier this afternoon and spoke to the protesters.
A High Court order granted earlier this week prohibits such activity taking place outside meat plants.