Northern Ireland police diffused a wheelie bin filled with 500 pounds of explosives on Saturday.
The bomb was in an underpass outside Newry in a blue Ford transit van.
Politicians said that the bomb could have had a similar impact as the Omagh bombing in August 1998, where 29 people were killed and 220 were injured, in a Herald Scotland story.
Police said that the attempted attack was likely by the dissident republicans, who are ones who wanted Northern Ireland to be Irish rather than British, and who do not accept the 1998 peace deal that ended decades of violence, according to CNN.
The dissident republicans were also blamed for the April 2 killing of a police officer with a booby-trap bomb in Omagh.