Two men have been arrested in County Donegal as part of an investigation into the murder of prison officer David Black.

As part of a joint operation by the Gardaí and PSNI - a man in his 40s and a man in his late 50s were detained earlier this afternoon.

The man in his 40s is being held at a Garda Station in Dublin and is due to appear before the High Court tomorrow morning on foot of a European Arrest warrant.

The second man is being held at Letterkenny Garda Station.

As part of the operation a 47 year old woman was also arrested in Belfast and is being questioned at Musgrave Serious Crime Suite.