A man (41) has been arrested over the Christmas bomb attack in the Cathedral Quarter of Belfast.
The bomb was left in a holdall in Exchange Street West and exploded on Friday December 13th when the area was busy with Christmas party-goers.
The incident came after a telephone bomb warning was made and hundreds of people were evacuated.
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No-one was injured.
There was widespread condemnation of the attack from both sides of the border.
The PSNI said the man was arrested in North Belfast He has been taken to Antrim police station for questioning.