1. The Troubles

    Bombs Found in Northern Ireland

    US Secretary of State Hillary Clinton (R) looks up as she is greeted by Northern Ireland's First Minister Peter Robinson (L) as she arrives at Stormont Castle in Belfast, Northern Ireland, on December 7, 2012. Clinton arrived in Northern Ireland on December 7 amid renewed tensions after Belfast city councillors voted not to fly the British flag all year around.   Clinton flew into a military airport outside Belfast for talks with senior leaders in the British province, wrapping up one of her last trips to Europe as America's top diplomat. AFP PHOTO / PETER MUHLY        (Photo credit should read PETER MUHLY/AFP/Getty Images)

    Peter Muhly, AFP / Getty Images

    Four men were arrested in Northern Ireland on Thursday after authorities discovered a homemade bomb in a car in the city of Londonberry—just one day before U.S. Secretary of State Hillary Clinton was due to arrive. A letter bomb was found in another part of Northern Ireland after a man was seen acting suspiciously near a mailbox. Officials said it was “a viable device capable of causing death or serious injury.” They come amidst renewed tensions between Unionist groups, who support ties with Britain, and dissident Republicans.

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