Police in Northern Ireland say a bomb found in an abandoned van earlier in the week was one of the biggest there in recent years.
The BBC reports the bomb weighed 500lb (225kg). It was in a wheelie bin in a van under the main road from Belfast to Dublin and may have been destined for a town centre.
Chief Superintendent Alasdair Robinson said the device could have caused huge devastation and loss of life.
The van was stolen in Maynooth in the Irish Republic in January. Police said it may have been abandoned en route to its ultimate target due to a larger than normal police presence in the area.
Army bomb experts carried out several controlled explosions on the vehicle on Friday night.