CNN
The Amaq agency released a statement declaring ISIS spokesman Abu Muhammad al-Adnani's death.
Adnani was reportedly responsible for coordinating attacks on targets in the West. He also released propaganda statements on behalf of the group.
Adnani had massive influence inside ISIS.
His death is a "major blow" to ISIS, according to Rita Katz, a terrorism analyst and the director of the SITE Intelligence Group.
"When calling for lone wolf attacks in [the] West, ISIS fighters/supporters quote Adnani more than any other individual," Katz said on Twitter.
The Bastille Day attack in Nice, France - during which a man killed more than 80 people after he drove a truck into a crowd - seemed possibly inspired by an Adnani statement from 2014 that called on supporters to kill "infidels" wherever they can.
"If you are not able to find an IED or a bullet, then single out the disbelieving American, Frenchman, or any of their allies," Adnani said. "Smash his head with a rock, or slaughter him with a knife, or run him over with your car, or throw him down from a high place, or choke him, or poison him."
Official channels have so far not confirmed the death, but terrorism experts have stated that the statement from Amaq appears legitimate.
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