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A member of Afghanistan's special forces point his gun as he observes the enemy lines in Achin district of Nangarhar province, in eastern Afghanistan April 14, 2017. Image Credit: REUTERS

JALALABAD, Afghanistan: The US military’s largest non-nuclear bomb killed at least 36 militants as it decimated a deep tunnel complex of the Daesh militants group, Afghan officials said on Friday, ruling out any civilian casualties.

The GBU-43/B Massive Ordnance Air Blast bomb — better known as the “Mother Of All Bombs” — hit Daesh hideouts in Achin district in eastern Nangarhar province on Thursday.

“As a result of the bombing, key Daesh hideouts and deep tunnel complex were destroyed and 36 Daesh fighters were killed,” the defence ministry said in a statement.

US President Donald Trump had earlier called the mission “very, very successful”.

Pentagon later released a video of the moment the bomb hit its target.

The Afghan presidential palace said precautions were taken to avoid civilian casualties.

The huge bomb, delivered via an MC-130 transport plane, has a blast yield equivalent to 11 tonnes of TNT, and the weapon was originally designed as much to intimidate foes as to clear broad areas.

“The GBU-43/B is the largest non-nuclear bomb ever deployed in combat,” Air Force spokesman Colonel Pat Ryder said.

Achin district governor Esmail Shinwari said the bomb landed in the Momand Dara area of Achin district.

“The explosion was the biggest I have ever seen. Towering flames engulfed the area,” Shinwari told AFP.

“We don’t know anything about the casualties so far, but since it is a Daesh stronghold we think a lot of Daesh fighters may have been killed.”

Hotbed of militancy

Nangarhar, which borders Pakistan, is a hotbed of Daesh militancy. US forces have conducted a number of air strikes on militant bases in the area since August last year.

Daesh, 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 radicals.

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.

The top United States military commander in Afghanistan said on Friday that the decision to deploy one of the largest conventional bombs ever used in combat was purely tactical, and made as part of the campaign against Islamic State-linked fighters.

As many as 36 suspected Islamic State militants were killed in the strike on Thursday evening in the eastern province of Nangarhar, Afghan defence officials said, adding there were no civilian casualties.

The statement could not be independently verified, and on Friday, Afghan and foreign troops in the vicinity were not allowing reporters or locals to approach the scene of the attack.

The strike came as US President Donald Trump prepares to dispatch his first high-level delegation to Kabul, amid uncertainty about his plans for the nearly 9,000 American troops stationed in Afghanistan.

Nicknamed "the mother of all bombs," the weapon was dropped from an MC-130 aircraft in the Achin district of Nangarhar, bordering Pakistan.

US Army General John Nicholson said he was in constant communication with officials in Washington, but the decision to use the 21,600-pound (9,797-kg) GBU-43 bomb was based on his assessment of military needs and not broader political considerations.

Extensive obstacle

"This was the first time that we encountered an extensive obstacle to our progress," he said of a joint Afghan-US operation that has been targeting Islamic State since March.

"It was the right time to use it tactically against the right target on the battlefield."

Afghan and US forces were at the scene of the strike and reported that the "weapon achieved its intended purpose," Nicholson said.

Afghan Defence Ministry spokesman Dawlat Waziri said no civilians were harmed in the massive blast that targeted a network of caves and tunnels that had been heavily mined.

"No civilian has been hurt and only the base, which Daesh used to launch attacks in other parts of the province, was destroyed," Waziri said in a statement.

He was using an Arabic term that refers to Islamic State, which has established a small stronghold in eastern Afghanistan and launched deadly attacks on the capital, Kabul.

The GBU-43 is a GPS-guided munition that had never before been used in combat since its first test in 2003, when it produced a mushroom cloud visible from 20 miles (32 km) away.

The bomb's destructive power, equivalent to 11 tonnes of TNT, pales in comparison with the relatively small atomic bombs dropped on Japan at the end of World War Two, which had blasts equivalent to between 15,000 and 20,000 tonnes of TNT.

Strong Support

In Achin village, about 3 miles (5 km) from the remote, mountainous area where the bomb was dropped, witnesses said the ground shook, but homes and shops appeared unaffected.

"Last night's bomb was really huge, when it dropped, everywhere, it was shaking," said resident Palstar Khan, adding that he believed no civilians were in the area hit.

He praised the strike, saying killing Islamic State fighters was a "positive move."

Other residents said they were used to seeing militants climbing up and down the mountain every day, making occasional visits to the village.

"They were Arabs, Pakistanis, Chinese and local insurgents coming to buy from shops in the bazaar," said resident Raz Mohammad.

"Testing Ground"

On Friday, the village was swarming with Afghan and international troops, as helicopters and other aircraft flew overhead.

Afghan President Ashraf Ghani's office said in a statement the attack was a part of a joint operation by Afghan and international troops.

"Afghan and foreign troops closely coordinated this operation and were extra cautious to avoid any civilian casualties," it said.

But former president Hamid Karzai condemned the use of the weapon on Afghan soil.

"This is not the war on terror, but the inhuman and most brutal misuse of our country as (a) testing ground for new and dangerous weapons," he said on social media network Twitter.

The Taliban, the main security threat to Afghan and NATO forces trying to quell their stubborn insurgency, also denounced the bombing.

"Using this massive bomb cannot be justified and will leave a material and psychological impact on our people," the Taliban, who compete with Islamic State in Afghanistan, said in a statement.

American officials said the bomb had been positioned for possible use in Afghanistan for "some time" since the administration of former president Barack Obama.

The United States has steadily intensified its air campaign against Islamic State and Taliban militants in Afghanistan, with the Air Force deploying nearly 500 weapons in the first three months of 2017, up from 300 in the corresponding 2016 period.

Thursday's strike was not the first time Islamic State fighters have been targeted by heavy American bombardment in Nangarhar, where a US special forces soldier was killed battling militants a week ago.

Last year, B-52 bombers operating out of Qatar flew at least two missions in Afghanistan for the first time since 2006.

Such aircraft can carry as much as 70,000 pounds (32,000 kg) of bombs, missiles, or other weapons on each mission.

In March, US forces conducted 79 "counterterror strikes" against Islamic State in Nangarhar, killing as many as 200 militants, according to the US military command in Kabul.

US military officials estimate there are about 600 to 800 Islamic State fighters in Afghanistan, mostly in Nangarhar, but also in the neighbouring province of Kunar.

The United Nations has raised concerns that the American air campaign is swelling civilian casualties in Afghanistan.

Last year, air strikes by international forces caused at least 127 civilian deaths and 108 injuries, up from 103 deaths and 67 injuries in 2015, the United Nations said.

'Purely tactical'

The top United States military commander in Afghanistan said on Friday that the decision to deploy one of the largest conventional bombs ever used in combat was purely tactical, and made as part of the campaign against Islamic State-linked fighters.

As many as 36 suspected Islamic State militants were killed in the strike on Thursday evening in the eastern province of Nangarhar, Afghan defence officials said, adding there were no civilian casualties.

The statement could not be independently verified, and on Friday, Afghan and foreign troops in the vicinity were not allowing reporters or locals to approach the scene of the attack.

The strike came as US President Donald Trump prepares to dispatch his first high-level delegation to Kabul, amid uncertainty about his plans for the nearly 9,000 American troops stationed in Afghanistan.

Nicknamed "the mother of all bombs," the weapon was dropped from an MC-130 aircraft in the Achin district of Nangarhar, bordering Pakistan.

US Army General John Nicholson said he was in constant communication with officials in Washington, but the decision to use the 21,600-pound (9,797-kg) GBU-43 bomb was based on his assessment of military needs and not broader political considerations.

Extensive obstacle

"This was the first time that we encountered an extensive obstacle to our progress," he said of a joint Afghan-US operation that has been targeting Islamic State since March.

"It was the right time to use it tactically against the right target on the battlefield."

Afghan and US forces were at the scene of the strike and reported that the "weapon achieved its intended purpose," Nicholson said.

Afghan Defence Ministry spokesman Dawlat Waziri said no civilians were harmed in the massive blast that targeted a network of caves and tunnels that had been heavily mined.

"No civilian has been hurt and only the base, which Daesh used to launch attacks in other parts of the province, was destroyed," Waziri said in a statement.

He was using an Arabic term that refers to Islamic State, which has established a small stronghold in eastern Afghanistan and launched deadly attacks on the capital, Kabul.

The GBU-43 is a GPS-guided munition that had never before been used in combat since its first test in 2003, when it produced a mushroom cloud visible from 20 miles (32 km) away.

The bomb's destructive power, equivalent to 11 tonnes of TNT, pales in comparison with the relatively small atomic bombs dropped on Japan at the end of World War Two, which had blasts equivalent to between 15,000 and 20,000 tonnes of TNT.

Strong support

In Achin village, about 3 miles (5 km) from the remote, mountainous area where the bomb was dropped, witnesses said the ground shook, but homes and shops appeared unaffected.

"Last night's bomb was really huge, when it dropped, everywhere, it was shaking," said resident Palstar Khan, adding that he believed no civilians were in the area hit.

He praised the strike, saying killing Islamic State fighters was a "positive move."

Other residents said they were used to seeing militants climbing up and down the mountain every day, making occasional visits to the village.

"They were Arabs, Pakistanis, Chinese and local insurgents coming to buy from shops in the bazaar," said resident Raz Mohammad.

'Testing Ground'

On Friday, the village was swarming with Afghan and international troops, as helicopters and other aircraft flew overhead.

Afghan President Ashraf Ghani's office said in a statement the attack was a part of a joint operation by Afghan and international troops.

"Afghan and foreign troops closely coordinated this operation and were extra cautious to avoid any civilian casualties," it said.

But former president Hamid Karzai condemned the use of the weapon on Afghan soil.

"This is not the war on terror, but the inhuman and most brutal misuse of our country as (a) testing ground for new and dangerous weapons," he said on social media network Twitter.

The Taliban, the main security threat to Afghan and NATO forces trying to quell their stubborn insurgency, also denounced the bombing.

"Using this massive bomb cannot be justified and will leave a material and psychological impact on our people," the Taliban, who compete with Islamic State in Afghanistan, said in a statement.

American officials said the bomb had been positioned for possible use in Afghanistan for "some time" since the administration of former president Barack Obama.

The United States has steadily intensified its air campaign against Islamic State and Taliban militants in Afghanistan, with the Air Force deploying nearly 500 weapons in the first three months of 2017, up from 300 in the corresponding 2016 period.

Thursday's strike was not the first time Islamic State fighters have been targeted by heavy American bombardment in Nangarhar, where a US special forces soldier was killed battling militants a week ago.

Last year, B-52 bombers operating out of Qatar flew at least two missions in Afghanistan for the first time since 2006.

Such aircraft can carry as much as 70,000 pounds (32,000 kg) of bombs, missiles, or other weapons on each mission.

In March, US forces conducted 79 "counterterror strikes" against Islamic State in Nangarhar, killing as many as 200 militants, according to the US military command in Kabul.

US military officials estimate there are about 600 to 800 Daesh fighters in Afghanistan, mostly in Nangarhar, but also in the neighbouring province of Kunar.

The United Nations has raised concerns that the American air campaign is swelling civilian casualties in Afghanistan.

Last year, air strikes by international forces caused at least 127 civilian deaths and 108 injuries, up from 103 deaths and 67 injuries in 2015, the United Nations said.