Northern Ireland police investigate 600-pound massive bomb

The bomb was aimed at killing police officers, a spokeswoman for the Police Service of Northern Ireland said Wednesday. No arrests have been made, police said.

An anonymous call September 1 alerted police to an explosive device somewhere in the area of Forkhill, a town in County Armagh, less than 1 mile (1.5 kilometers) from the border with the Republic of Ireland, police said.

The caller was vague about the location, so police issued warning calls to the public while they searched for the bomb, police said.

A second call a few days later allowed police to focus on a specific area of Forkhill, allowing them to find the bomb along a road and dismantle it Tuesday, police said.

Army experts estimate it contained about 270 kilograms (600 pounds) of homemade explosives, police said. That means it was bigger than the bomb that exploded in the Northern Irish town of Omagh in 1998, killing 29 people and wounding more than 300.