Massive US bomb death toll rises to 94

U.S. Senator Jim Inhofe, a member of the Senate Armed Services Committee, said the use of this bomb was a sign that the United States was committed to Afghanistan.

He once said the invasion of Afghanistan was a mistake, though he later walked back that statement, saying he "always supported" U.S. involvement in the country.

Trump described the Afghanistan bombing as "another very, very successful mission".

The bomb killed almost 100 suspected militants, and destroyed weapons, ammunition and underground tunnels.

Nangarhar provincial spokesman Attaullah Khogyani gave a death toll of 90, far higher than the initial toll of 36 dead ISIS fighters given by Afghan officials.

Achin district governor Esmail Shinwari said "at least 92 Daesh fighters were killed" - adding there were "no military and civilian casualties at all". "Nor have there been any reports of civilian casualties".

Karzai took to Twitter and wrote: 'I vehemently and in strongest words condemn the dropping of the latest weapon'.

Foreign policy experts said that it appeared the use of a specialized weapon like the GBU-43 had more to do with the type of target - tunnels - than the United States sending any message to other countries by using such a powerful weapon.

The Pentagon confirmed the GBU-43, known as the "Mother Of All Bombs" (MOAB), was dropped on caves in Nangarhar Province, very close to the border with Pakistan.

"We had persistent surveillance over the area before, during and after the operation, and now we have Afghan and USA forces on the site, and see no evidence of civilian casualties", Nicholson said. This is a country of free speech'.

Islamic State has fewer than 1,000 fighters in Afghanistan.

The bodies of the militants were found around the blast site.

Meanwhile a number of Afghans hit back at Karzai over his comments.

On Saturday, Karzai lashed out at government and the U.S over Thursday night's bombing.

Ghani has failed to build the kind of domestic following that Karzai still has despite stepping down in 2014. Several mid-level Isis commanders are said to be among the dead.

'I made a decision to get America off my soil, ' he said.

"This bomb wasn't only a violation of our sovereignty and a disrespect to our soil and environment, but will have bad effects for years", he said. President Ashraf Ghani threw his support behind the bombardment.

The bombing - along with the first U.S. military strikes against the Syrian regime last week - mark a dramatic change in attitude for Trump, who advocated an isolationist, "America first" foreign policy during his election campaign.

The massive bomb was deployed after fighting intensified over the past week and US -backed ground forces struggled to advance on the area, where a USA special forces soldier was killed on April 8.