A new Irish Republican Army faction said today that its members carried out the fatal shooting of prison officer David Black, who was killed on his way to work on November 1.
The group sent a statement to the Irish News claiming its first killing.
It said it was a punishment for the "degradation" of prisoners belonging to various IRA factions in Maghaberry prison where Mr Black worked.
The statement was simply signed "the IRA" but the group is reportedly the result of a merger of three IRA splinter groups hostile to the peace process in Northern Ireland.
Inmates of the top-security jail have protested over the last year against strip-searches carried out by guards looking for weapons, drugs and mobile phones.
The Police Service of Northern Ireland said it could not comment on the statement as the investigation into Mr Black's death was ongoing.
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