In Belfast, Protestant loyalists begin a picket of Holy Cross, a Catholic primary school for girls. For the next 11 weeks, riot police escort the schoolchildren and their parents through hundreds of protesters, some of whom hurl missiles and abuse. The protest sparks fierce rioting and grabs world headlines.

The Holy Cross dispute occurred in 2001 and 2002 in the Ardoyne area of north Belfast, Northern Ireland. During the 30-year conflict known as the Troubles, Ardoyne had become segregated Ulster Protestants and Irish Catholics lived in separate areas. This left Holy Cross, a Catholic primary school for girls, in the middle of a Protestant area. In June 2001during the last week of school before the summer breakProtestant loyalists began picketing the school, claiming that Catholics were regularly attacking their homes and denying them access to facilities.

The picket resumed on 3 September, when the new school term began. For weeks, hundreds of loyalist protesters tried to stop the schoolchildren and their parents from walking to school through their area. Hundreds of riot police, backed up by British soldiers, escorted the children and parents through the protest each day. Some protesters shouted sectarian abuse and threw stones, bricks, fireworks, blast bombs and urine-filled balloons at the schoolchildren, their parents and the RUC. The "scenes of frightened Catholic schoolgirls running a gauntlet of abuse from loyalist protesters as they walked to school captured world headlines". Death threats were made against the parents and school staff by the Red Hand Defenders, a loyalist paramilitary group. The protest was condemned by both Catholics and Protestants, including politicians. Some likened the protest to child abuse and compared the protesters to North American white supremacists in the 1950s. During this time, the protest sparked bouts of fierce rioting between Catholics and Protestants in Ardoyne, and loyalist attacks on police. On 23 November, the loyalists ended the protest after being promised tighter security for their area and a redevelopment scheme. The security forces remained outside the school for several months after.

In January 2002, a scuffle between a Protestant and a Catholic outside the school sparked a large-scale riot in the area and attacks on other schools in north Belfast. The picket was not resumed and the situation has been mostly quiet since then. The following year, the BBC aired a documentary-drama about the protests.

Belfast (UK: BEL-fahst, elsewhere ; from Irish: Béal Feirste [bʲeːlˠ ˈfʲɛɾˠ(ə)ʃtʲə], meaning 'mouth of the sand-bank ford') is the capital and largest city of Northern Ireland, standing on the banks of the River Lagan on the east coast. It is the 12th-largest city in the United Kingdom and the second-largest on the island of Ireland. It had a population of 343,542 in 2019. Belfast suffered greatly during the violence that accompanied the partition of Ireland, and especially during the more recent conflict known as the Troubles.

By the early 19th century, Belfast was a major port. It played an important role in the Industrial Revolution in Ireland, becoming briefly the biggest linen-producer in the world, earning it the nickname "Linenopolis". By the time it was granted city status in 1888, it was a major centre of Irish linen production, tobacco-processing and rope-making. Shipbuilding was also a key industry; the Harland and Wolff shipyard, which built the RMS Titanic, was the world's largest shipyard. Belfast as of 2019 has a major aerospace and missiles industry. Industrialisation, and the inward migration it brought, made Belfast Northern Ireland's biggest city. Following the partition of Ireland in 1921, Belfast became the seat of government for Northern Ireland. Belfast's status as a global industrial centre ended in the decades after the Second World War.

Belfast is still a port with commercial and industrial docks, including the Harland and Wolff shipyard, dominating the Belfast Lough shoreline. It is served by two airports: George Best Belfast City Airport, 3 miles (5 kilometres) from the city centre, and Belfast International Airport 15 miles (24 kilometres) west of the city. The Globalization and World Cities Research Network (GaWC) listed Belfast as a Gamma + global city in 2020.