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The MOAB is also known as the "mother of all bombs." A MOAB is a 21,600-pound, GPS-guided munition that is America's most powerful non-nuclear bomb. The bomb was dropped by an MC-130 aircraft, operated by Air Force Special Operations Command, according to the military sources. They said the target was an ISIS tunnel and cave complex as well as personnel in the Achin district of the Nangarhar province.

Gen. John Nicholson, Commander of U.S. Forces in Afghanistan, said in a statement. "This is the right munition to reduce these obstacles and maintain the momentum of our offensive against [ISIS]."
The statement said U.S. forces took every precaution to avoid civilian casualties.