Published Tuesday, 08 October 2013
The footage shows a man wheeling the bicycle along the Foyle river walkway. (© PSNI)
The 40-year-old was detained in Co Antrim a day after new CCTV footage was released.
A pipe bomb and a booby-trapped bike were left on the river embankment to the rear of the council premises on 20 September 2012.
Police said the secondary device on the bike was timed to explode while officers were in the area dealing with the first bomb, which was in a rucksack.
The man, who was arrested on Tuesday morning, is currently being questioned by Serious Crime Branch officers at Antrim Serious Crime Suite.
Police on Monday issued images of the suspected bomber, along with photos of the rucksack, a black Compass model with a blue and red design, and a blue-framed Freerider bicycle.
The footage shows the suspected bomber wheeling the bicycle along the Foyle river walkway and a short time later retracing his steps, having planted the rucksack and the bike.
Chief Inspector Jon Burrows said: "I would appeal to anyone who recognises this individual to contact police on 0845 600 8000 ext 64911. Alternatively, anyone who does not want to provide their details can phone the independent charity Crimestoppers on 0800 555 111."
© UTV News