Meanwhile, Shinzo Abe, the Japanese prime minister, warned that North Korea may already be able to launch missiles loaded with the sarin nerve agent at Japan, a security situation he called "increasingly severe".
Spicer said the bomb was dropped at around 7 p.m. local time and described it as "a large, powerful and accurately delivered weapon".
On Thursday night, a GBU-43/B Massive Ordinance Air Blast bomb (MOAB), capable of destroying an area equivalent to nine city blocks, was dropped on a network of fortified underground tunnels ISIS had been using to stage attacks on government forces. "Pleased Air Force dropped MOAB against ISIL in Afghanistan". It is more than 9m (30 ft) in length. A U.S. Special Forces soldier advising the Afghans was killed in the area Saturday, the first U.S. combat death this year. I think China has been really working hard on this.
A general view of Achin district, in Jalalabad, after US forces dropped Thursday the bomb, Afghanistan, Friday, April 14, 2017. The official name for the bomb is a GBU-43B. 'As ISIS-K's losses have mounted, they are using IEDs, bunkers and tunnels to thicken their defense, ' said General John Nicholson, commander, US Forces- Afghanistan.
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He said all civilians had left the area since the start of the anti-IS operation.
President Donald Trump said Thursday the bombing was "another successful job".
The bomb was dropped in response to IS' increasing use of bunkers and tunnels to "thicken their defense", General John Nicholson, commander of US forces in Afghanistan said. It was dropped from a MC-130 aircraft, Pentagon spokesman Adam Stump said.
"This is not the war on terror but the inhuman and most brutal misuse of our country as a testing ground for new and risky weapons", he said on Twitter. "US Forces will continue offensive operations until ISIS-K is destroyed in Afghanistan", read the statement from US Forces Afghanistan.
According to the Air Force, the last time the MOAB was tested in 2003, a huge mushroom cloud could be seen from 32km away.
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ISIS first emerged in the summer of 2015 in the country's east, fast gaining ground and support, often among disaffected Taliban or Afghan youth.
Fighting between ISIS and Afghan forces in the region has intensified recently.
Islamic State's offshoot in Afghanistan is suspected of carrying out several attacks on minority Shi'ite Muslim targets. It is north of Tora Bora, the complex network of caves from where Al-Qaeda leader Osama bin Laden gave USA forces the slip and escaped into Pakistan in late 2001.
IS in Afghanistan: How successful has the group been? He flexed USA military muscles last week by ordering a cruise missile attack on a Syrian government airbase in retaliation for a poison gas attack. But he asked questions over whether the bombing was going to help the larger strategy in Afghanistan, and said he wanted to learn if there were any civilian casualties. The US said partnered forces had wrongly identified the location as an IS base, when it was in fact a strategic position for the Syrian Democratic Forces.
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