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Twenty one years ago, on 15th August in 1998, a car bomb exploded in the town of Omagh, County Tyrone, in Northern Ireland.

The attack was carried out by a group who called themselves the Real Irish Republican Army.

The bomb was detonated in a vehicle parked in the middle of the main street in Omagh.

The explosion killed 29 people and injured 220 others, making it the largest loss of life in a single incident, since a conflict known as the Troubles began.

The conflict in Northern Ireland dates back to its separation from the rest of Ireland in the early 1920s.

Great Britain had ruled Ireland for hundreds of years, but it split off from British rule - leaving Northern Ireland as part of the UK, and the Republic of Ireland as a separate country.

The break-up led to decades of unrest and violence in Northern Ireland.

There were two main sides:

This period was known as The Troubles. It began in the late 1960s and lasted for 30 years.

Thousands of people on both sides were killed in the conflict.

At the end of the 1990s, after decades of conflict, the two sides reached a deal to stop fighting.

This meant the Unionists and Nationalists had an opportunity to try to work through their differences.

In 1998, something called the Good Friday Agreement was signed. It was seen as a major step towards peace in Northern Ireland.

It resulted in a new government being formed where power would be shared between Unionists and Nationalists.

You can read more about The Troubles and The Good Friday Agreement here.

The Omagh bombing was so shocking because it happened less than three months after The Good Friday Agreement had been signed - a deal that was supposed to bring an end to the fighting.

Around the world people were shocked by the event, and several world leaders expressed their sadness at what happened.

The Queen expressed her sympathy for the families of those who had died, and the Prince of Wales visited Omagh to meet those affected.

Tony Blair, who was Prime Minister of the UK at the time, called the bombing an "appalling act of savagery and evil".