The United States dropped "the mother of all bombs", the largest non-nuclear device it has ever unleashed in combat, on a network of caves and tunnels used by Islamic State in eastern Afghanistan on Thursday, the military said.
"The Secretary General and I had a productive discussion about what more North Atlantic Treaty Organisation can do in the fight against terrorism", Trump said.
On Twitter, Afghanistan President Ashraf Ghani approved of the strike, saying it was "designed to support the efforts of the Afghan National Security Forces (ANSF) and U.S. forces. conducting clearance operations in the region".
The Ministry of Defence said in a statement that several IS caves and ammunition caches were destroyed by the giant bomb, which terrified villagers on both sides of the Afghanistan-Pakistan border with its "earsplitting blast".
"This is the right munition to reduce these obstacles and maintain the momentum of our offensive against Isis-K", he added, using the U.S. military's acronym for the IS affiliate. Based on the acronym, it has been nicknamed the "Mother Of All Bombs".
"The GBU-43/B is the largest non-nuclear bomb ever deployed in combat", Air Force spokesman Colonel Pat Ryder said.
A former USA intelligence officer says the "mother of all bombs" fired on Islamic State forces in Afghanistan carried a chilling message for North Korea.
"We are entering what perhaps might come close to a showdown between the USA and the north", he told the Daily Star.
Cancian added that while sending a message to Syria or North Korea could have been among the secondary factors considered, they would not have been the main reason for using this type of weapon. "It was designed during the Iraq War as a means to penetrate destroy underground nuclear facilities", he told the Daily Star.
President Donald Trump touted the bombing as evidence of a more muscular US foreign policy since he took office in January after eight years of President Barack Obama.
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"Everybody knows exactly what happened, and what I do is I authorise my military", he said. A spokesman for the country's Ministry of Defense later said the bombing was carried out "in coordination" with Afghan military forces.
"If you look at what's happened over the last eight weeks and compare that really to what's happened over the past eight years, you'll see there's a tremendous difference, tremendous difference".
Afghan soldiers and police, with the aid of thousands of foreign military advisers, are struggling to hold off a resurgent insurgency led by the Taliban, as well as other groups like Islamic State. We are very proud of them.
Trump described the bombing as a "very successful mission". It was not immediately clear how much damage the device did.
US forces took "all precautions necessary to prevent civilian casualties and collateral damage", he said.
Pakistani villagers living near the Afghan border said the explosion was so loud they thought a bomb ad been dropped in their village by USA warplanes targeting terrorists in Pakistan.
US State Department spokesman Mark Toner said Washington is "working with the government of Afghanistan and our partners in the region in order to deny any terrorist organization - that includes al Qaeda as well - a safe haven or any kind of material support on the ground".
According to the air force, the last time the MOAB was tested in 2003, a huge mushroom cloud could be seen from 32 kilometres away.
The Afghanistan bombing, along with the intervention in Syria last week, mark a dramatic change in attitude for Trump, who advocated an isolationist, America-first foreign policy during his election campaign.