A man is being questioned by police in Northern Ireland in connection with a car bomb which exploded outside a British army base which also acts as MI5's headquarters in the North.
The bomb, placed in a taxi, detonated outside Palace Barracks, in Holywood, Co Down, shortly after midnight on Monday. The Real IRA has claimed responsibility for the attack.
An elderly man who walking near the barracks at the time was treated for minor injuries.
Police arrested a 30-year-old man in the Ardoyne area of north Belfast and he is being questioned at Antrim Police Station.