The US military's largest non-nuclear bomb killed dozens of Islamic State militants as it smashed their mountain hideouts, Afghan officials said Friday, ruling out any civilian casualties despite the weapon's destructive capacity.
The bomb, unleashed by the US for the first time in combat, is expected to further erode IS's capabilities in Afghanistan and sends a warning to the much bigger Taliban group ahead of their annual spring offensive.
It comes only a week after US President Donald Trump ordered missile strikes against Syria in retaliation for a suspected chemical attack, and as China warned of the potential for conflict amid rising tensions over North Korea.
"As a result of the bombing, key Daesh (IS) hideouts were destroyed and 36 IS fighters were killed," the Afghan defence ministry said, adding that the bombing was carried out in coordination with local military forces.
Trump had earlier called the mission "very, very successful".
The huge bomb, delivered via an MC-130 transport plane, has a blast yield equivalent to 11 tons of TNT, and the weapon was originally designed as much to intimidate foes as to clear broad areas.
The explosion reverberated for miles and engulfed the remote area in towering flames, destroying what Afghan officials called a network of underground IS tunnels and caves that had been mined against conventional ground attacks.
"The explosion was the biggest I have ever seen," Achin governor Esmail Shinwari told AFP, adding the bomb landed in the Momand Dara area of the district.
An Afghan militant source told AFP from an undisclosed location that locals had described the ground shaking "like an earthquake", with people being knocked unconscious by the blast.
"People have started leaving the area fearing more bombings," he said.
The arsenal was dropped after fighting intensified over the past week and US-backed ground forces struggled to advance on the area. An American special forces soldier was killed last Saturday in Nangarhar while conducting anti-IS operations.
- US raids surge-
Security experts say IS had built their redoubts close to civilian homes, but the government said thousands of local families had already fled the area in recent months of fighting.
"Precautions were taken to avoid civilian casualties," President Ashraf Ghani said on Twitter, throwing his support behind the bombardment.
It was "designed to support the efforts of the Afghan National Security Forces (ANSF) and US forces... conducting clearance operations in the region."
The bombardment marks a surge in US military raids against global jihadist groups.
The Pentagon's announcement of the attack drove markets down, with Asian bourses headed south following overnight losses on Wall Street.
It added to concerns among investors already wary of risks over Syria and North Korea, as well as the outcome of the French presidential election.
The Taliban, who are expected to soon announce the start of this year's fighting season, also condemned what it called "America's heavy use of weapons on Afghanistan".
Nangarhar, which borders Pakistan, is a hotbed of IS militancy. US forces have conducted a number of air strikes on jihadist bases in the area since August last year.
IS, notorious for its reign of terror in Syria and Iraq, has been making inroads into Afghanistan in recent years. It has attracted disaffected members of the Pakistani and Afghan Taliban as well as Uzbek Islamists.
But the group has been steadily losing territory in the face of heavy pressure both from US air strikes and a ground offensive led by Afghan forces.