When other paramilitaries began declaring ceasefires in 1994, the INLA did not follow suit until four years later.

BBC: Who are the INLA?

Another factor is that a list containing LVF prisoners expecting visits on the day of Wright's murder was inadvertently shown to INLA prisoners.

BBC: News | UK Politics | Calls for Wright murder probe

According to the University of Ulster's Troubles archive site CAIN, the INLA is believed to have a small arsenal and several dozen active members.

BBC: Who are the INLA?

While most of the main paramilitary groups have destroyed their weapons or at least begun the process, the INLA has not decommissioned any of its arms.

BBC: Who are the INLA?

The questions centre on how INLA gunmen were able to sneak out of their wing, which they shared with the LVF, and cross the roof of the block undetected by prison staff.

BBC: News | UK Politics | Calls for Wright murder probe