His death will mark the second United States killing of a key terrorist in the region within months.
Washington, Kabul-The leader of ISIS' branch in Afghanistan and Pakistan was reportedly killed in a US drone strike on July 26, a Pentagon spokesman said after the Afghan ambassador to Pakistan made an official announcement of the news to Reuters.
The killing of the Islamic State group's leader in Afghanistan and Pakistan has dealt a major blow to the jihadists, but despite a USA -backed scorched earth offensive the regional franchise is far from over, observers said Saturday.
Khan was known to participate in attacks against United States and coalition forces, with his leadership in ISIS resulting in terrorizing Afghans in the Nangarhar province of Afghanistan.
Mr Trowbridge says Khan's death will "disrupt" IS operations in Afghanistan.
Crew members of Punjab government's helicopter, that crash-landed in Afghanistan last week, safely arrived back home, Samaa reported Saturday.
That operation was considered the most significant U.S. raid inside Pakistan since al-Qaeda's leader, Osama bin Laden, was killed in 2011.
The IS leader was targeted on July 26 in Nangarhar, a southern Afghan province, where the joint special forces of the US and Afghanistan were conducting anti-IS operations.
Afghan Taliban today released six Pakistani helicopter crew members who were captured by the terror group on August 4.
Pakistani leaders had been in touch with the Afghan government leaders and top commander of the foreign forces for the safe release of the hostages.
Hafiz Saeed, a top ISIS commander in Afghanistan, was killed last month by a USA air strike.
The death of the senior ISIS leader will interrupt the Islamic State's operations.
Saeed Khan masterminded attacks including the group's first ever deadliest in Kabul last month, killing almost 80 people belonging to Hazara community. Trowbridge said the airstrike was in Achin district, as opposed to Kot district.
The former Taliban leader Mullah Akhtar Mansour was killed in a U.S. drone strike inside Pakistan in May.
Kabul also accuses Islamabad of backing Islamic extremists in their country, claiming that the Pakistani military provides sanctuaries to the Taliban and other jihadist groups to launch attacks on Afghan and foreign troops on their soil.
The spokesman for US and North Atlantic Treaty Organisation forces in Afghanistan, Brig.