Police quiz four over letter-bomb attacks in England
Four people have been arrested as part of an investigation into a spate of letter-bomb attacks in England, including Army recruitment offices in Kent.
Two men, aged 35 and 46, and two women, aged 21 and 44, were arrested in Londonerry and taken to the serious crime suite at Antrim police station for interview.
A police spokesman said the investigation was being led by detectives from the PSNI serious crime branch, which has been working with officers from the south east counter terrorism unit in England.
In February, devices were sent to Army recruitment offices in Oxford, Brighton, Canterbury, Aldershot, Reading and Chatham, and the Queensmere shopping centre in Slough.
Last October dissident republicans were also blamed for sending letter bombs to high-profile political and security figures in Northern Ireland.
None of the devices detonated. They were described as being crude in design, but having the potential to injure.