The bombing of Omagh town centre on a busy Saturday afternoon 10 years ago was the worst single terrorist atrocity during Northern Ireland's Troubles.
Twenty nine people and unborn twins were murdered in the Real IRA attack. More than 200 people were injured.
No-one has ever been convicted of the crime.
Now - using archive material from BBC radio - we look back to the events of 15 August 1998:
Slideshow production by Paul Kerley.