Afghanistan officials said 36 Islamic State militants were killed when the USA dropped the "mother of all bombs" on a tunnel complex Thursday.
US President Donald Trump said Thursday the bombing was "another successful job".
American lawmakers have applauded the Trump administration after the U.S. military dropped its largest non-nuclear bomb on Islamic State targets in eastern Afghanistan, saying that "it sends a clear message" to terror groups in the region. Pentagon's recent test in Afghanistan of a powerful non-nuclear bomb, nicknamed "The Mother of All Bombs" (MOAB), targeted tunnels that were possibly built by the United States, former NSA contractor Edward Snowden wrote on his Twitter page. It is regarded as particularly effective against clusters of targets on or just underneath the ground. Other types of bombs can be more effective against deeper, hardened tunnels. It was the first time that IS had officially spread outside the Arab world.
The area where the bomb was dropped is mostly mountainous and sparsely populated, BBC correspondents say. It was not immediately clear how much damage the device did.
Meanwhile, thousands of USA and South Korean troops and heavy weaponry have been mobilized for their largest-ever joint military exercise. "It doesn't make any difference if it does or not", Trump told reporters Thursday at the White House.
"The strike was created to minimize the risk to Afghan and U.S forces conducting clearing operations in the area while maximizing the destruction of IS fighters and facilities", read the statement.
The US defence ministry claims the so called "mother of all bombs" has killed 36 Isis militants in Afghanistan.
"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.
"The United States takes the fight against ISIS very seriously and in order to defeat the group we must deny them operational space, which we did", Spicer said.
It was the first major militant group to directly challenge the Afghan Taliban's dominance over the local insurgency. "It is upon us, Afghans, to stop the #USA".
"It was the right weapon for the right target, and not in retaliation", the official said.
President Donald Trump led U.S. military used the MOAB, the largest non-nuclear weapon, in Afghanistan to target caves of ISIS terrorist in Afghanistan.
The top USA commander in Afghanistan said recently that he needed several thousand more global troops in order to break a stalemate in the long war with Taliban insurgents.
US officials say intelligence suggests Islamic State is based overwhelmingly in Nangarhar and neighboring Kunar province.
Estimates of its strength in Afghanistan vary.
Pakistani villagers living near the Afghan border said the explosion was so loud they thought a bomb ad been dropped in their village by US warplanes targeting terrorists in Pakistan.