Real IRA delivers bloody Easter Sunday message: We will cary fight to U.K.

Donaldson was shot dead in April 2006, four months after he admitted to being a long-serving British spy, and no group claimed responsibility for his murder.

"The days of a campaign involving military operations every day or every few days, are over. We're looking for high-profile targets, though we'll obviously take advantage when other targets present themselves," he said.

The newspaper said the group will also threaten McGuiness, who denounced last month's attack as well as the killing of a policeman by another splinter group, the Continuity IRA.

"Let us remind our former comrade (McGuiness) of the nature and actions of a traitor," read a printed version of the statement, referring to what happened to Donaldson.

"No traitor will escape justice regardless of time, rank or past actions. The republican movement has a long memory."

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Nster.com