Four people have been arrested on suspicion of involvement in a spate of attempted dissident republican letter bomb attacks in Northern Ireland and south-east England, including on a number of Armed Forces recruitment offices.
The two men, 35 and 46, and two women, 21 and 44, were detained in Londonderry and have been taken to the Police Service of Northern Ireland's (PSNI) Serious Crime Suite in Antrim.
They are being questioned by detectives investigating the sending of explosive devices to Armed Forces careers offices in Oxford, Brighton, Canterbury, Aldershot, Reading and Chatham and the Queensmere shopping centre in Slough in February.
In October last year dissident republicans opposed to the peace process were also blamed for sending a series of letter bombs to high profile political and security figures in Northern Ireland.
None of the devices detonated.
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