A second letter bomb has been discovered at a postal sorting office in Northern Ireland less than 24 hours after a similar device was found, police have said.
Stormont's First Minister Peter Robinson and Deputy First Minister Martin McGuinness condemned those who sent the explosive packets.
The second device was found at a depot in Lisburn a day after a bomb was discovered in an envelope in a sorting office in Londonderry.
It is understood both were addressed to Maghaberry high security prison in Co Antrim. The finger of blame will again be directed at dissident republicans opposed to the peace process.
In a joint statement, Mr Robinson and Mr McGuinness said: "We utterly condemn the recent letter bombs discovered in postal sorting offices in Derry/Londonderry and Lisburn."