Dissident Irish republican campaign: Two off-duty British Army soldiers were shot dead by Real IRA paramilitaries outside Massereene Barracks in Antrim, Northern Ireland.

The dissident Irish republican campaign began at the end of the Troubles, a 30-year political conflict in Northern Ireland. Since the Provisional Irish Republican Army called a ceasefire and ended its campaign in 1997, breakaway groups opposed to the ceasefire and to the peace agreements have continued a low-level armed campaign against the security forces in Northern Ireland. Dissident republicans have targeted the Police Service of Northern Ireland (PSNI) and the British Army in gun and bomb attacks as well as with mortars and rockets. They have also carried out bombings that are meant to cause disruption. However, their campaign has not been as intensive as the Provisional IRA's and political support for dissident groups is "tending towards zero".

The Massereene Barracks shooting took place at Massereene Barracks in Antrim, Northern Ireland. On 7 March 2009, two off-duty British soldiers of the 38 Engineer Regiment were shot dead outside the barracks. Two other soldiers and two civilian delivery men were also shot and wounded during the attack. A dissident Irish republican paramilitary group, the Real IRA, claimed responsibility.

The Real Irish Republican Army, or Real IRA (RIRA), was a dissident Irish republican paramilitary group that aimed to bring about a United Ireland. It was formed in 1997 following a split in the Provisional IRA by dissident members, who rejected the IRA's ceasefire that year. Like the Provisional IRA before it, the Real IRA saw itself as the only rightful successor to the original Irish Republican Army and styled itself as simply "the Irish Republican Army" in English or Óglaigh na hÉireann in Irish. It was an illegal organisation in the Republic of Ireland and designated a proscribed terrorist organisation in the United Kingdom and the United States.