Vote triggers renewed debate on North's constitutional position

Sinn Féin have called for a vote on Irish unity; the DUP says the North is "safe and secure" within the UK.

The Brexit vote in the EU referendum has triggered a renewed debate in Northern Ireland on its constitutional position within the UK.

With the region backing Remain by 56% to 44%, Sinn Féin has insisted the time has come for a border poll on Irish unity.