Some bereaved family members laid single white roses and then said prayers at the glass obelisk which marks the spot where the Real IRA attack occurred on August 15, 1998.
A crowd of more than 100 people lined the streets in the Co Tyrone town as the short ceremony took place.
Twenty-nine people, including a woman pregnant with twins, were killed by the bomb, the worst loss of life in a single incident during the Troubles.
It came just months after the historic Good Friday Agreement.
No-one has ever been criminally convicted of the attack.
Stanley McCombe, who lost his wife Ann in the bombing, said of the anniversary: "It is a sad day for all those who have suffered in this atrocity.
"I think about this every day, not just today, not just the anniversary, there's always something that will bring it to your attention.
"You walk through the door of my house, close the door behind you, my dog greets me, but that's it."
Kevin Skelton, who lost his wife Philomena in the bombing, said yesterday's gathering shows "people have not forgotten".
هذه القصة مأخوذة من طبعة August 16, 2023 من Irish Daily Mirror.
ابدأ النسخة التجريبية المجانية من Magzter GOLD لمدة 7 أيام للوصول إلى آلاف القصص المتميزة المنسقة وأكثر من 9,000 مجلة وصحيفة.
بالفعل مشترك ? تسجيل الدخول
هذه القصة مأخوذة من طبعة August 16, 2023 من Irish Daily Mirror.
ابدأ النسخة التجريبية المجانية من Magzter GOLD لمدة 7 أيام للوصول إلى آلاف القصص المتميزة المنسقة وأكثر من 9,000 مجلة وصحيفة.
بالفعل مشترك? تسجيل الدخول
THREE-FLOWING FOOTBALL!
Klopp has come up with a new dynamic triple threat on counter
MOORE'S MERRIER
Late, late leveller lifts new boss Darren
WE'VE GAT A GREAT CHANCE
Tompkins and Davies praise Gatland's clear vision and reckon 'the sky's the limit' for Wales
BYRNE: DON'T SEND ME TO BRITISH JAIL
Kinahan mobster fights extradition to UK over 'human rights'
Bruce wife: Our family's dementia heartache
'STAR MAY NOT BE AWARE HE HAS IT'
Killer Letby retrial over 'attempted murder of baby girl'
But heartache for other families
Garda chief confirms officer injured by Dail mob
A GARDA chief said an officer was injured in last week's Dail protests by a far-right mob.
Sophia so good
Hollywood great Loren doing well'after broken hip surgery
Eternal no more
Louise is accused of 'throwing bandmates under a bus' after quitting reunion in bitter row
Our lives will never be the same again..
Family mourns 'hero and son' struck by car