The head of the militant Islamic State (IS) group in Afghanistan, Abdul Hasib, has been killed in an operation led by Afghan special forces in Nangarhar province, President Ashraf Ghani said on Sunday.

Hasib, appointed last year after his predecessor Hafiz Saeed Khan died in a US drone strike, is believed to have ordered a series of high-profile attacks including one in March on the main military hospital in Kabul by a group of militants disguised as doctors, a statement said.

Last month, a Pentagon spokesman said Hasib had probably been killed during a raid by US and Afghan special forces in Nangarhar during which two US army Rangers were killed, but there was no confirmation.

The local affiliate of the IS, sometimes known as IS Khorasan, after an old name for the region that includes Afghanistan, has been active since 2015, fighting both the Taliban as well as Afghan and US forces.

It is believed to maintain links with the main IS group in Iraq and Syria but has considerable operational independence.

US and Afghan special forces, backed by drone strikes and other air support, have waged a series of operations against IS-K this year, killing dozens of their fighters, mainly in Nangarhar, on the border with Pakistan.

Defeating the group remains one of the top US priorities in Afghanistan and last month the United States dropped its largest non-nuclear device on a network of caves and tunnels used by IS in Nangarhar, killing 94 fighters, including four commanders.