Senior British security officials told ABC News there is \"concrete intelligence\" that the groups have been trying to move operations beyond Northern Ireland to London. MI5, the security agency in charge of countering domestic terrorism in Britain, has recently increased surveillance of suspected Irish terror leaders, shifted resources from Al Qaeda to the Irish groups and raised the threat of Irish-related terrorism from moderate to substantial.

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Concern has also been heightened with the upcoming Royal Wedding, which has captured the world's attention and could be an attractive target for terror attacks, say experts.

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\"I think there's no doubt the dissidents have the intent, and they are increasingly showing they have the capability,\" said Martyn Frampton, a professor at Queen Mary University of London and author of \"Legion of the Rearguard: Dissident Irish Republicanism.\" \"If you put those two things together, you do have a very serious threat.\"

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