United States President Joe Biden says a global "terrorist threat" has been removed when the head of the self-proclaimed Islamic State died from detonating explosives, after US special forces swooped on his Syrian hideout in an "incredibly challenging" night-time helicopter raid.
Mr Biden said he had ordered an assault by troops rather than an airstrike in order to minimise civilian casualties, even though this meant "much greater risk to our own people".
There were no casualties among the US forces.
The death of Abu Ibrahim al-Hashimi al-Qurashi is the biggest setback to the IS jihadist group since his predecessor, the better-known Abu Bakr al-Baghdadi, was killed in a US commando raid in the same Syrian region of Idlib in 2019.
"Last night's operation took a major terrorist leader off the battlefield. And sent a strong message to terrorists around the world. We will come after you and find you," Mr Biden said in nationally televised remarks.
In the brief, sombre address from the White House's Roosevelt Room, Mr Biden said the house targeted overnight in the town of Atme contained "families, including children".
Abu Ibrahim al-Hashimi al-Qurayshi, the leader of the self-proclaimed Islamic State group. President Joe Biden said that al-Qurayshi has been killed in Syria. Source: CTC Sentinel
"As our troops approached to capture the terrorist, in a final act of desperate cowardice, with no regard to the lives of his own family or others in the building, he chose to blow himself up," Mr Biden said.
Qurashi detonated the entire top floor, Mr Biden said, "taking several members of his family with him".
The three-level building of raw cinder blocks bore the scars of an intense battle, with torn window frames, charred ceilings and a partly collapsed roof.
AFP correspondents shot photographs that show a simple room with little more than foam mattresses, blankets, colourful clothes and children's toys.
The entire top floor of the house was detonated. Source: AP
An Iraqi from the Turkmen-majority city of Tal Afar, Qurashi was also known as Amir Mohammed Said Abd al-Rahman al-Mawla. He replaced Baghdadi after he too blew himself up in a US raid in October 2019.
The US government had offered a $10 million (A$14 million) reward for information leading to Qurashi.
The Syrian Observatory for Human Rights said seven civilians were among at least 13 people killed in the operation, four of them children.
Pentagon spokesman John Kirby said at least three civilians died, Qurashi's wife and their two children.
Rent paid
Atme residents were shocked to hear that their neighbour in the modest house surrounded by olive trees was in fact the IS leader.
One of the world's most wanted men was living there with his family and his sister.
Even his landlord, Mohamed al-Sheikh, was perplexed by the news.
He thought he had leased the house to a cab driver.
"This man lived here for 11 months. I did not notice anything strange about him," he said.
"He would pay me rent and leave."
Footage after the operation showed a black plume of smoke billowing out of the damaged house.
Inside, blood was splattered on the wall and the floor.
A witness told AFP he woke to the sound of helicopters.
"Then we heard small explosions. Then we heard stronger explosions," said Abu Ali, a displaced Syrian living in Atme, adding the United States blasted messages to reassure residents.
He heard American forces say "don't worry. We're just coming to this house ... to rid you of the terrorists."
The American helicopters took off from a military base in the Kurdish-controlled city of Kobani, Abdel Rahman said.
Elite, US-trained members of the Kurdish-led Syrian Democratic Forces joined the operation, Mr Rahman said.
One of the helicopters had to be destroyed after developing mechanical problems, according to a senior US official, and its smouldering remains were photographed in the village of Jinderes in northern Aleppo province.
Farhad Shami, who heads the media office of the US-backed SDF, said the operation targeted "the most dangerous international terrorists."
One of the US helicopters had to be destroyed after developing mechanical problems. Source: AP
Kurdish forces had also taken part in the raid against Baghdadi in 2019.
Fierce battle
Atme is home to a huge camp for families displaced by the decade-old conflict and which experts have warned was being used by jihadists as a place to hide among civilians.
US special forces have carried out several operations against high-value jihadist targets in the area in recent months, with the military on October 23 announcing the killing of senior Al-Qaeda leader Abdul Hamid al-Matar.
The area, the last enclave to actively oppose the government of Bashar al-Assad, is mostly administered by a body loyal to Hayat Tahrir al-Sham, a group led by former members of what was once Al-Qaeda's franchise in Syria.
The death of the IS leader comes two weeks after the group staged a huge attack to spring its fighters from a Kurdish-run prison in northeastern Syria.
Hundreds were killed in what was IS's most high-profile operation since the demise of its "caliphate" nearly three years earlier.
