Two major roads, the Westway and the M1, were closed during the morning rush hour while police carried out a controlled detonation, the Belfast Telegraph reported.
Chief Superintendent Pauline Shields, the district commander, said police had to be careful.
"Had this been a viable device, there could have been devastating consequences had it exploded," she said. "Once again our community has been disrupted and the lives of residents put at risk by a cowardly element intent on causing as much disruption as they can."
In County Fermanagh, another suspected bomb in a beer keg left by the side of a road also proved to be a fake.
A security alert was called last Friday after a 60-kilogram device was found in an abandoned car in Fermanagh. While investigators believed it was intended for a nearby police station, a dissident republican group, Oglaigh na hEireann or Warriors of Ireland, said in a message the target was the Lough Erne golf resort 16 miles away where the Group of Eight summit is scheduled for June.
Video of Victoria’s Secret models trying to 'twerk' hits Instagram
Wisconsin business offering 'therapeutic cuddling' forced to close