There has been sharp criticism of the decision by Northern Ireland's security forces to close four border checkpoints in County Fermanagh during the hours of darkness. Nationalists have said it is tantamount to imposing a curfew, but police say the move is dictated by fear of cross-border attacks.

Report shows County Fermanagh checkpoints.

Derryard checkpoint, which was attacked by the Irish republican Army (IRA) a year ago.

Helicopter carrying debris.

Footage of British Prime Minister, Margaret Thatcher at a heavily fortified checkpoint during her visit last month.

Extensive damage caused by recent IRA attacks on checkpoints.

Checkpoint today.

The reporter is Póilín Ní Chiaráin.

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