Police 'know identity of killers'

The area was cordoned off after the explosion

Police hunting the bombers who killed a building worker in Londonderry a year ago, have set up road blocks at the murder scene in an attempt to find more witnesses.

David Caldwell, 51, was killed when a booby-trapped lunchbox exploded in his hands as he arrived for work at a Territorial Army base on the Limavady Road on 1 August 2002.

The killers cut through a perimeter wire of the camp to leave their bomb.

The Real IRA was blamed for the murder of the Protestant civilian construction worker.

Police said it was an indiscriminate attack, which was callous and inhumane.

David Caldwell was killed in blast

Although eight suspects have been questioned, detectives have not managed to get enough evidence to press charges.

Detective Inspector Robbie Paul disclosed how close police were to charging the killers.

"It's our belief that the Real IRA carried out this murder," he said.

"We believe that we have a fairly good intelligence picture of how this murder was carried out, and by whom.

"But unfortunately intelligence is not evidence."

Mr Caldwell's partner, Mavis McFaul, said she found it hard to cope with the loss.

"There are days that are good days and days that are bad, because I miss Davy so much," she said.

"I wouldn't wish any family to go through what I have gone through."