Detectives investigating the 1976 Kingsmills massacre have arrested a man in Newry.
Officers from the PSNI’s Legacy Investigation Branch said the 59-year-old has been detained on suspicion of the murder of the 10 Protestant workmen who were taken from their minibus and shot by the side of the road.
The sectarian atrocity was found to have been carried out by the IRA although the republican group has never admitted responsibility.
One man, Alan Black from Bessbrook, was shot 18 times during the attack but survived.
A Catholic worker who was also travelling in the vehicle was singled out by the gunmen and released unharmed.
Detective Chief Inspector Ian Harrison, from LIB, said: “The male was arrested in the Newry area today and is currently assisting with enquiries.
“I would also appeal to anyone with any information in relation to the murders at Kingsmill to contact police on 101 or alternatively, contact the Crimestoppers charity anonymously on 0800 555 111.”