US AfghanistanThe United States dropped a massive GBU-43 bomb, the world’s largest non-nuclear bomb, in eastern Afghanistan on Thursday against a series of mountainous caves used by ISIS militants near the border of Pakistan. Also known as (MOAB) “mother of all bombs,” the GBU-43 is a 21,600 pound GPS-guided munition that reportedly has a 1 mile blast radius. The MOAB was specifically designed to destroy underground nuclear facilities and was first tested in March 2003, but has never been used in combat until today. The bomb was dropped from a MC-130 aircraft in the Achin district of Nangarhar province, Pentagon spokesman Adam Stump said.

General John Nicholson, the head of U.S. and international forces in Afghanistan, said the bomb was used against tunnels, caves and bunkers housing fighters of the Islamic State in Afghanistan, also known as ISIS-K.

“This is the right munition to reduce these obstacles and maintain the momentum of our offensive against ISIS-K,” Nicholson said in a statement.

It was not immediately clear how much damage the bomb did.