The Northern Ireland Secretary of State has defended the siting and refurbishment of border observation towers, calling them an extremely valuable security measure. The towers have been criticised by Seamus Mallon of the Social Democratic and Labour Party (SDLP).

Report shows refurbishment work in progress on an observation tower along the South Armagh border.

British Army patrol in nearby fields.

British soldiers in undergrowth.

Helicopter flying low behind a hill.

A soldier using binoculars.

Interview with Northern Ireland Secretary, Tom King, on the success of the border posts.

The reporter is Gary Honeyford.

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