Sinn Fein has said some of its politicians in west Tyrone have received threats, including bullets.
It understood they were contained in packages which were left at a cemetery in Strabane.
It is believed a local priest was then tipped off about the packages. Sinn Fein said they do not know who was behind the threats.
In December, police reportedly warned Sinn Fein's Gerry Adams and Gerry Kelly about dissident republican threats.
Chief Constable Sir Hugh Orde said the threats to the Sinn Fein leadership were "very real".
Republican sources said the threats to senior party members came from disaffected IRA members who left the organisation in recent months.
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