The Omagh bombing was a car bombing on 15 August 1998 in the town of Omagh in County Tyrone, Northern Ireland, It was carried out by a group calling themselves the Real Irish Republican Army (Real IRA), a Provisional Irish Republican Army (IRA) splinter group who opposed the IRA's ceasefire and the Good Friday Agreement, signed earlier in the year. The bombing killed 29 people and injured about 220 others, making it the deadliest single incident of the Troubles in Northern Ireland. Telephoned warnings which did not specify the actual location had been sent almost forty minutes beforehand but police inadvertently moved people toward the bomb.The bombing caused outrage both locally and internationally, spurred on the Northern Ireland peace process, and dealt a severe blow to the dissident Irish republican campaign. The Real IRA denied that the bomb was intended to kill civilians and apologised; shortly after, the group declared a ceasefire. The victims included people of many backgrounds and ages: Protestants, Catholics, six teenagers, six children, a woman pregnant with twins, two Spanish tourists and others on a day trip from the Republic of Ireland. Both unionists and Irish nationalists were killed and injured. As a result of the bombing, new anti-terrorism laws were swiftly enacted by both the United Kingdom and Ireland.

British, Irish and US intelligence agencies allegedly had information which could have prevented the bombing, most of which came from double agents inside the Real IRA, but this information was not given to the Royal Ulster Constabulary (RUC). In 2008, the BBC reported that British intelligence agency GCHQ was monitoring conversations between the bombers as the bomb was being driven into Omagh.A 2001 report by the Police Ombudsman said that the RUC Special Branch failed to act on prior warnings and criticised the RUC's investigation of the bombing. Police reportedly obtained circumstantial and coincidental evidence against some suspects, but they were unable to convict anyone of the bombing. Colm Murphy was tried and convicted of conspiring to cause the bombing, but was released on appeal after it was revealed that the Garda forged interview notes used in the case. Murphy's nephew Sean Hoey was also tried but was acquitted. In June 2009, the victims' families won a £1.6 million civil action settlement against four defendants, who were found liable for the bombing. In 2014, Seamus Daly was charged with the murder of 29 people; however, the case against him was withdrawn in 2016.

Northern Ireland (Irish: Tuaisceart Éireann [ˈt̪ˠuəʃcəɾˠt̪ˠ ˈeːɾʲən̪ˠ] (listen); Ulster-Scots: Norlin Airlann) is a part of the United Kingdom that is variously described as a country, province, territory or region. Located in the northeast of the island of Ireland, Northern Ireland shares a border to the south and west with the Republic of Ireland. In 2011, its population was 1,810,863, constituting about 30% of the island's population and about 3% of the UK's population. The Northern Ireland Assembly (colloquially referred to as Stormont after its location), established by the Northern Ireland Act 1998, holds responsibility for a range of devolved policy matters, while other areas are reserved for the British government. Northern Ireland co-operates with the Republic of Ireland in several areas.Northern Ireland was created in 1921, when Ireland was partitioned by the Government of Ireland Act 1920, creating a devolved government for the six northeastern counties. The majority of Northern Ireland's population were unionists, who wanted to remain within the United Kingdom. They were generally the Protestant descendants of colonists from Great Britain. Meanwhile, the majority in Southern Ireland (which became the Irish Free State in 1922), and a significant minority in Northern Ireland, were Irish nationalists and Catholics who wanted a united independent Ireland. Today, the former generally see themselves as British and the latter generally see themselves as Irish, while a Northern Irish or Ulster identity is claimed by a large minority from all backgrounds.The creation of Northern Ireland was accompanied by violence both in defence of and against partition. During 1920–22, the capital Belfast saw major communal violence, mainly between Protestant unionist and Catholic nationalist civilians. More than 500 were killed and more than 10,000 became refugees, mostly Catholics. In the following decades, Northern Ireland had an unbroken series of Unionist Party governments. There was informal mutual segregation by both communities, and the Unionist governments were accused of discrimination against the Irish nationalist and Catholic minority, in what First Minister of Northern Ireland, David Trimble, called a "cold house" for Catholics. In the late 1960s, a campaign to end discrimination against Catholics and nationalists was opposed by loyalists, who saw it as a republican front. This unrest sparked the Troubles, a thirty-year conflict involving republican and loyalist paramilitaries and state forces, which claimed over 3,500 lives and injured 50,000 others. The 1998 Good Friday Agreement was a major step in the peace process, including paramilitary disarmament and security normalisation, although sectarianism and segregation remain major social problems, and sporadic violence has continued.The economy of Northern Ireland was the most industrialised in Ireland at the time of Partition of Ireland, but declined as a result of the political and social turmoil of the Troubles. Its economy has grown significantly since the late 1990s. The initial growth came from the "peace dividend" and increased trade with the Republic of Ireland, continuing with a significant increase in tourism, investment and business from around the world. Unemployment in Northern Ireland peaked at 17.2% in 1986, dropping to 6.1% for June–August 2014 and down by 1.2 percentage points over the year, similar to the UK figure of 6.2%.Cultural links between Northern Ireland, the rest of Ireland, and the rest of the UK are complex, with Northern Ireland sharing both the culture of Ireland and the culture of the United Kingdom. In many sports, the island of Ireland fields a single team, with the Northern Ireland national football team being an exception to this. Northern Ireland competes separately at the Commonwealth Games, and people from Northern Ireland may compete for either Great Britain or Ireland at the Olympic Games.