KABUL, Afghanistan — At 7:32 p.m. local time April 13, 2017, U.S. Forces Afghanistan conducted a strike on an Islamic State of Iraq and Syria-Khorasan tunnel complex in Achin district, Nangarhar province, Afghanistan, as part of ongoing efforts to defeat ISIS-K in Afghanistan, according to a U.S. Forces Afghanistan news release

ISIS-K, also known as the Korasan group, is based in the Afghanistan-Pakistan region and is composed primarily of former members of Tehrik-e Taliban Pakistan and the Afghan Taliban.

The strike used a GBU-43/B Massive Ordnance Air Blast bomb dropped from a U.S. aircraft. The strike was designed to minimize the risk to Afghan and U.S. forces conducting clearing operations in the area while maximizing the destruction of ISIS-K fighters and facilities.

“As ISIS-K’s losses have mounted, they are using (improvised bombs), bunkers and tunnels to thicken their defense,” said Army Gen. John W. Nicholson, commander of U.S. Forces Afghanistan. “This is the right munition to reduce these obstacles and maintain the momentum of our offensive against ISIS-K.”

U.S. forces took every precaution to avoid civilian casualties with this strike and will continue offensive operations until ISIS-K is destroyed in Afghanistan.