Groups are seeking reassurance that the UK leaving Europe won't affect trade
Mock customs checkpoint set up to stop traffic. Go-slow kicking off on M1 below. pic.twitter.com/ne9wgjoFml— Richard Chambers (@newschambers) February 18, 2017
In a statement, MEP Matt Carthy said he is supporting the demonstrators.
"The very last thing we need to see is the re-emergence of border controls, customs posts and all the paraphernalia of Partition which had been banished with the peace process.
"The uncertainty which is already damaging trade and investment and impacting on cross-border business will be as nothing compared to the hardships which will ensue with the imposition of tariffs and the restriction of the free movement of goods, services and people on this island."
He also criticised Taoiseach Enda Kenny’s rejection of the proposition that the North be afforded a special designated status within the EU, calling it a "huge mistake".
"Without such a designation, a hardening of the border is inevitable."