Denis Donaldson was killed in 2006
Two men have been arrested over the murder of MI5 agent Denis Donaldson.
The 55-year-old, a senior Sinn Fein official and close colleague of Gerry Adams, was shot dead at a remote cottage near Glenties, Co Donegal, in 2006 after being exposed as a British spy.
Gardai arrested two men, one aged in his 30s and the other in his 40s, on Sunday.
They were being questioned in Letterkenny Garda Station under section 30 of the Offences Against the State Act and they can he detained for 72 hours.
Dissident republican group the Real IRA claimed responsibility for killing Mr Donaldson in 2009.
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