Video, Queen In Ireland: Suspect Devices Found In Dublin Ahead Of Monarch's Visit | World News | Sky News_ Irish police are on high alert after two suspect devices were found ahead of the Queen's historic visit there today. The first device - an improvised bomb - was found last night in the luggage compartment of a bus on the outskirts of Maynooth, near Dublin. Irish police carried out a controlled explosion to make that safe in the early hours of this morning. The second, found at a tram stop in Inchicore, Dublin, was made safe by the Irish army, but was later confirmed to be a hoax. In the past 24 hours, police in London have also destroyed an abandoned suitcase in a controlled explosion in Trafalgar Square. Part of the Mall in London, which leads to Buckingham Palace, was closed as officers dealt with the item The Foreign Office has said the visit will go ahead, despite the potential danger faced by the Queen. The devices follow a coded threat issued to Scotland Yard by republican dissidents yesterday - but Irish police have vowed it will not alter their security plans. The telephone threat contained a recognised code word, but did not specify a time or place. Superintendent John Gilligan said: "Our plan has been in place for a number of weeks. "Officers from the UK are also part of the plan which is large enough to allow the visit to be conducted in the proper fashion." A £26m security operation has been launched in Dublin ahead of the Queen's arrival today. Police are patrolling the streets, parking is prohibited in many areas and large swathes of the city are being closed off. A former Irish intelligence officer warned the Queen's visit was the "last chance saloon" for a movement that probably has no future. "The dissidents know that this is really their last chance saloon, as we're probably in the death throes of militant republicanism," Decklan Power told Sky News. "They're becoming increasingly irrelevant to their cultural heartland in the fringe areas in the north and one or two areas in the south. "That's why it's also one of the most dangerous times." When the Queen, joined by the Duke of Edinburgh, arrives in Dublin she will become the first British monarch to travel to the Republic in 100 years and the first since the nation gained independence from Britain. More than 8,500 Irish police have been mobilised to ensure its success the biggest security operation in the history of the state. After being welcomed by President Mary McAleese, the Queen will make one of the more sensitive stops on her visit at the Garden of Remembrance. She will lay a wreath for those who fought for Irish independence including those who died in the 1916 Easter Rising. One officer told Sky News: "There are definitely elements out there who want to disrupt this visit. We just have keep a lid on things." All locations of the monarch's visit have been checked by security officials, including Mrs McAleese's presidential home in Phoenix Park. When she hosts the Queen and Duke of Edinburgh there later today, her promise of building bridges will be fully realised.