The dissident republican attack in 1998 devastated the Co Tyrone village, killing 29 people, including a woman pregnant with twins, and injuring hundreds of others. It came just months after the historic Belfast/Good Friday Agreement and was the greatest loss of life in a single incident in Northern Ireland’s troubled past. No-one has ever been criminally convicted of the attack.
The service took place in the town's memorial garden. Representatives from the British and Irish governments attended the service.
5. Omagh bomb 25th anniversary
Gearoid Doherty (right) who lost his brother Oran in the bombing, lifts his son Daithi, aged 4, to place a flower Photo: Brian Lawless
6. Omagh bomb 25th anniversary
People attend a service to mark the 25th anniversary of the Omagh bomb Photo: Brian Lawless
7. Omagh bomb 25th anniversary
Emotional scenes at today's service to mark the 25th anniversary of the Omagh bomb Photo: Brian Lawless
8. Omagh bomb 25th anniversary
The scene at the Memorial Gardens in Omagh today Photo: Brian Lawless