Murdered prison officer David Black

DETECTIVES probing the motorway ambush murder of prison officer David Black have released a man from custody.

The 46-year-old suspected from the Lurgan area was the fourth person to be arrested and released during the investigation.

Mr Black, a 52-year-old father of two, was shot dead on the M1 as he drove to work at Maghaberry Prison on 1 November.

His funeral was held in his home town of Cookstown, County Tyrone, on Tuesday.

On Thursday, detectives investigating the murder revisited the scene exactly one week after the attack.