Security has been stepped up in Ireland ahead of the Queen's first visit there next week.
Deutsche Welle reports that groups opposed to Britain's control of Northern Ireland are threatening to disrupt the event.
Up to 5000 police officers and 2000 soldiers will provide security during the monarch's engagements.
''The gardai (police) are prepared if necessary to deal with any issue that may arise,'' said Superintendent John Gilligan.
A protest is planned when the Queen visits the Garden of Remembrance in Dublin, a memorial to those who died fighting for independence from Britain.
Another is planned for the evening of a state banquet on 18 May that will also be attended by British Prime Minister David Cameron.
The UEFA Europa League football final will be held in Dublin between Portuguese teams Porto and Benfica the same evening.
Three days after the Queen's departure, US President Barack Obama will arrive to meet state leaders and visit the town of Moneygall in County Offaly from where one of his ancestors emigrated in the 1800s.
