A memorial service to mark the tenth anniversary of the Manchester bomb is being held at the city's cathedral.
The bomb went off inside a van on Corporation Street
A candle will be lit at exactly 1117 BST and four seconds - the same time a 3,300lb bomb blew up on Corporation Street on 15 June 1996.
Hundreds of buildings were evacuated and thousands moved from the city centre which meant nobody was killed although 200 people were injured.
The IRA's South Armagh Brigade made the bomb, but no arrests have been made.
Greater Manchester Police claim it is unlikely anyone will be tried due to a lack of evidence.
The Arndale Centre was damaged in the blast
The bomb, hidden inside a white van left parked on the roadside for so long it had a parking ticket on it, left a crater in the road and destroyed nearby buildings.
One side of the Arndale Centre was torn apart, as was the Corn Exchange and nearby Marks and Spencer.
Ten years on, the city has benefited from widespread regeneration.
Thursday's service will be attended by victims of the Manchester city centre attack.
The candle will be lit by Lydia Ballam, an eight-year-old pupil from Chetham's School of Music.
It is intended to remember all of those whose lives have been affected by terrorism and as a symbol of hope for a peaceful world.
Plans drawn up to regenerate the city will be placed on the altar for the public to see.