Twenty-nine men, women and children died in the attack
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A man from south Armagh arrested in connection with the 1998 Omagh bomb has been released without charge.
The 37-year-old had been questioned at Antrim police station.
Twenty-nine men, women and children died and hundreds were injured in the attack. The bombing was later admitted by the dissident republican Real IRA.
Another man is already in police custody charged over the attack. Sean Gerard Hoey is expected to appear in court this week charged with murder.
Mr Hoey, 35, is due to appear before a court in Craigavon, County Armagh, for a remand hearing on Thursday.