Flagship cross-border projects, such as the Narrow Water Bridge, are under threat due to the Brexit result.
The projects, which also include the A5 dual carriageway from Tyrone to Derry and the restoration of the Ulster Canal, are all heavily dependent on funding from the EU.
But with EU infrastructure funding in doubt following the British vote to leave the EU, there is a reluctance among other funders to commit money to the projects.
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