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The US military has dropped the biggest non-nuclear bomb ever used in combat on an Islamic State group tunnel complex in Afghanistan, the Pentagon says.
The GBU-43/B Massive Ordnance Air Blast Bomb (MOAB), known as "the mother of all bombs", was first tested in 2003, but had not been used before.
The Pentagon said it was dropped from a US aircraft in Nangarhar province.
The news came hours after the Pentagon admitted an air strike in Syria mistakenly killed 18 rebels.
It said a partnered force had mistakenly identified the target location as an IS position, but the strike on 11 April had killed rebels from the Syrian Democratic Forces, which is backed by Washington.
'Many militants killed'
The strike in Afghanistan follows last week's death of a US special forces soldier fighting IS in Nangarhar.
The 21,600lb (9,800kg) bomb was dropped in Achin district on Thursday evening local time, the Pentagon said. It is more than 9m (30 feet) in length.
"We targeted a system of tunnels and caves that ISIS fighters use to move around freely, making it easier for them to target US military advisers and Afghan forces in the area," White House Press Secretary Sean Spicer said, using another name for IS.
He said necessary precautions were taken to prevent civilian casualties and "collateral damage".
The area where the bomb was dropped is mostly mountainous and sparsely populated, BBC correspondents say. Local sources said the explosion was so powerful it was heard in two neighbouring districts.
The US has not yet confirmed the results of the strike, but a local official told the BBC that many IS militants were killed, allegedly including the brother of a senior leader.
'A huge weapon' - Jonathan Marcus, BBC defence and diplomatic correspondent
The clue is in the ungainly name - the MOAB or GBU-43/B massive ordnance air blast is the US military's most destructive conventional (that is non-nuclear) bomb.
It is a huge weapon, and is GPS-guided. This looks to be the first time it has ever been used in combat.
It was dropped from a MC-130 aircraft - the US Special Forces variant of the Hercules transport. The weapon is carried on a special cradle inside the aircraft from which it is extracted by a parachute.
Its principle effect is a massive blast over a huge area. It is a larger version of weapons used during the Vietnam War.
The Trump administration's policy towards Afghanistan remains under consideration but the use of this weapon sends a powerful signal that IS is top of the administration's target list wherever its offshoots may be found.
Gen John Nicholson, commander of US forces in Afghanistan, said the jihadist group's "losses have mounted, they are using IEDs, bunkers and tunnels to thicken their defence.
"This is the right munition to reduce these obstacles and maintain the momentum of our offensive."
IS announced the establishment of its Khorasan branch - an old name for Afghanistan and surrounding areas - in January 2015. It was the first time that IS had officially spread outside the Arab world.
It was the first major militant group to directly challenge the Afghan Taliban's dominance over the local insurgency.
However, experts say it has struggled to build a wide political base and the indigenous support it expected in Afghanistan.
Estimates about IS's numerical strength inside Afghanistan vary, ranging from several hundred to a few thousand.