BRITAIN'S WORST nail-bomb atrocity was the IRA attack on the Household Cavalry in London's Hyde Park, which left four soldiers and seven horses dead. The bomb, containing 25lb (11kg) of gelignite surrounded by four- and six-inch nails and hidden in a car, was detonated by remote control on 20 July 1982.
Two hours later an explosion at a Regent's Park bandstand killed seven more soldiers.
Three years ago, at the Atlanta Olympics, a nail device killed a woman and wounded 110 others.
In 1996, two died and 80 were hurt when one went off on a Paris train.