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An old concrete block used by the British Army to block border roads is seen laying at the side of the road near the County Monaghan village of Glaslough near the County Armagh border, Northern Ireland, 27 May 2018. (Filled 28 May 2018). From the 1970s roads were blocked by the security forces in attempts to prevent paramilitary movement across the border and to make the border impermeable except for the crossing points subject to security checks. Roads were blocked with reinforced concrete blocks, metal spikes and craters; bridges were destroyed to make border-crossings via minor roads impossible. Photo/Paul McErlane