Afghan Drone Strike Killed IS Commander Abdul Rauf'
Mullah Abdul Rauf, centre, was captured by US forces in 2001 and spent six years in Guantanamo Bay Islamic State
A drone strike in Afghanistan has killed a militant commander who recently swore allegiance to Islamic State (IS), officials say.
The police chief of Helmand said that former Taliban commander Mullah Abdul Rauf had died in the Nato strike.
It emerged last month that Rauf had sworn allegiance to IS after falling out with the Taliban.
Tribal elders in northern Helmand say a car carrying up to six people was destroyed while crossing the desert.
The car was loaded with ammunition and exploded, reports said.
The Afghan Intelligence Agency also said Rauf had been killed. Nato confirmed the air strike, but not the intended target.
The BBC's David Loyn in Kabul says it is the first confirmed use of Nato air power alongside Afghan forces under their new mandate since combat troops withdrew at the end of 2014.
The militant commander's brother-in-law and four Pakistanis were also killed in the attack, Helmand police chief Nabi Jan Mullahkhel was quoted by Reuters as saying.
Correspondents say it poses the first serious challenge to the coherence of the Taliban leadership for many years.
Where else is Islamic State active?
Egypt: Based in Sinai, the IS branch was essentially a re-branding of Ansar Beit al-Maqdis, which first emerged in 2011 in the wake of the Egyptian revolution.
Libya: Three distinct Libyan IS "provinces" were announced in November - Barqah in the east, Tripoli in the west and Fazzan in the south.
Algeria: A breakaway group from al-Qaeda's North Africa branch (AQIM), the IS branch rose to prominence in September when it beheaded French tourist Herve Gourdel. Since then it has been largely silent.
Yemen and Saudi Arabia: The new branches have not claimed any activities yet but the move represents a symbolic challenge to al-Qaeda.
Afghanistan-Pakistan: IS says its branch here represents the historic Khorasan Province - a region covering Afghanistan, Pakistan and "other nearby lands".
Rauf, who spent six years in Guantanamo Bay after being captured by US forces in 2001, was reported to have fallen out with the leader of the Taliban, Mullah Omar.
He swapped the white flags of the Taliban for the black flags of IS and recruited followers in Helmand.
Rauf was then named as deputy leader of IS in "Khorasan" - an old name for Afghanistan - by the organisation in Syria.
The most senior IS commander for the region is Saeed Khan, who is based in Orakzai tribal agency in Pakistan.