17/05/2011 - Protests during the Queen's state visit to Ireland turned nasty on Tuesday with demonstrators in Dublin throwing fireworks and stones at security forces.
What started as a peaceful rally, organised by the nationalist Republican Sinn Fein, soon turned ugly as crowds pushed against police barricades and attempted to breach the security guarding Queen Elizabeth II.
The Queen's four day visit, ending on Friday in Cork, is reported to cost just under £30 million, which is angering many Irish people.
Streets across the capital have been cordoned off, with miles of barriers erected and some 4,000 police, backed up by 2,000 soldiers, have been patrolling the city centre.
Thousands of manholes have been sealed, and suspected dissidents arrested and questioned.
The visit is intended to replace centuries of animosity with good neighbourly relations.
Ireland was given self rule in a 1921 treaty and severed its last ties to the British monarchy in 1948. The north of the island remains part of the United Kingdom.