The inquiry will examine if steps could have been taken to prevent the 1998 bombing.

Twenty-nine people, including a woman pregnant with twins, died after the 1998 attack.

Kieran Doherty was shot dead by the Real IRA, of which he had been a member, in Derry in 2010.

Ex-ombudsman says parallel inquiry would be useful as victim's dad calls for Irish government meeting.

It will look at areas identified by judges relating to whether the attack could have been prevented.

An inquest into Denis Donaldson's murder was adjourned in County Donegal for a 26th time.

Survivors and the families of victims gathered in the County Tyrone town to mark the atrocity.

Twenty-nine people died in August 1998 in the single biggest atrocity of the Northern Ireland Troubles.