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(From Canberra Times)
I T WAS used in the Bali bombings in 2002, the bombings last November of British targets in Turkey, the World Trade Centre bombing in 1993 and the Oklahoma City bombing in 1995.
Ammonium nitrate - the compound allegedly seized in this week's raid - has previously been called al-Qaeda's explosive of choice, and has been used to kill hundreds of people in terrorist attacks world-wide.
The amount of ammonium nitrate found in the raids this week was the same amount as was used in the IRA bomb which exploded in London's Docklands at the South Quay rail station which killed two people in 1996. It was twice the amount reported to have been in each of the four vans used in the bombings in Turkey of the British Consulate, HSBC Bank and two synagogues last year.
The second and deadliest explosion used in the Bali bomb is believed to have contained only 50kg to 150kg of explosive - or about one fifth of the amount of ammonium nitrate found this week.
The substance is not difficult to get hold of. Millions of tonnes of it are produced each year as fertiliser.
Ammonium nitrate - or NH4NO3 - is the basic chemical constituent used in the manufacture of industrial explosives.