Four people arrested in connection with a letter bomb sent to Oxford’s Armed Forces Recruitment Office have been released without charge.
Two men, aged 35 and 46, and two women, aged 21 and 44, were arrested in Londonderry, Northern Ireland, on Wednesday.
They were questioned by detectives about the devices sent to six army recruitment offices including St Giles and the Queensmere shopping centre in Slough, Berkshire, in February.
An Irish dissident republican group calling itself the IRA claimed responsibility for the attempted attacks but none of the devices detonated.
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