Earlier this month Irish police intercepted a suspected dissident republican haul of rocket launchers and explosives in Co Tipperary.
It is believed the arms were en route to Northern Ireland.
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Sixteen people were injured when a train crashed into a railway station buffer on Monday.
"Our ability to pre-empt or respond to threats will be eroded if we don't keep up with our adversaries."
"You are one of the silence breakers and we all owe you a debt of gratitude."