Story highlights Four ISIS commanders were among those killed in the blast, Nangarhar official says

"This was the right weapon against the right target," says top US general in Afghanistan

Kabul (CNN) At least 94 Islamic State fighters were killed when the US military dropped America's most powerful non-nuclear bomb on ISIS targets in Afghanistan, an Afghan official said Saturday.

"The number of Daesh fighters killed in the US bomb in Achin district jumped to 94, including four commanders," Nangarhar provincial spokesman Attaullah Khogiani told CNN, using an alternative name for ISIS.

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"Our team is in the area and they are doing clearance, so the figure might change as they find more bodies," said Dawlat Waziri, a spokesman for the Afghan Ministry of Defense.

The initial toll given by Afghan officials for Thursday's strike was 36. A statement released Friday through ISIS' media wing, Amaq News Agency, said none of the terror group's fighters were killed or injured. CNN cannot independently confirm the number of casualties.

The GBU-43/B Massive Ordnance Air Blast Bomb (MOAB), nicknamed the "mother of all bombs" for its extraordinary force, was dropped at 7:32 p.m. local time Thursday, according to four US military officials with direct knowledge of the mission.