By David Hunter and Adam Evans
A 54 year old man arrested in connection with a 1990 bomb attack in Armagh which killed four people has been released pending a report to prosecutors.
Three police officers and a catholic nun lost their lives on the Killylea Road on July 24th.
The suspect was detained at Belfast International airport this morning, and has been questioned at Musgrave police station.
A 55 year old man was questioned last week, and has since been released pending a report to prosecutors.
Constable William Hanson, Reserve Constable Joshua Willis and Reserve Constable David Sterritt were killed in the blast alongside Sister Catherine Dunne.
A landmine located at a culvert on the Killylea Road was detonated on the 24th July 1990.
Another woman was also seriously injured in the blast.
Motorcyclist dies after collision on outskirts of Belfast
Murder probe launched after discovery of woman’s body in Co Fermanagh
Cars set alight in Co Armagh arson attack
Man escapes through window after arson attack at Downpatrick home
Noah Donohoe investigation looked at known sex offenders in area, inquest hears