David McKittrick: Crucial questions about Omagh are still unanswered
The Omagh bombing seemed to be an incident that was as straightforward as it was callous: a 500lb Real IRA car-bomb, placed in a market town on a busy Saturday afternoon, was detonated after a misleading warning.
The initial shock and horror at the multiple murders gave way to other emotions that included sympathy but also a determination to bring those responsible to justice. The authorities vowed that this would be done, but as time went on most of the legal sequels failed to produce convictions. It is technically possible that more prosecutions might be brought, but police admit that this becomes increasingly unlikely as time passes.
As the years went by many wondered about the performance of the security forces and in particular the intelligence agencies, both before and after the attack. It emerged that many of those involved were known to police and some were under a degree of surveillance.