A Russian air strike in Syria killed the chief strategist of so-called Islamic State (IS), the defence ministry in Moscow has said.
The Amaq news agency, linked to IS, earlier acknowledged that Abu Muhammad al-Adnani had died in Aleppo province.
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Russia says Adnani died on Tuesday in a Su-34 bomber raid on Umm Hawsh village.
The US said earlier that its planes had targeted Adnani in al-Bab city, but that it was “still assessing results”.
Adnani was one of the IS group’s most high-profile figures, with a $5m (£3.8m) bounty on his head.
The US said he had “co-ordinated the movement of Isil [IS] fighters, directly encouraged lone-wolf attacks on civilians and members of the military and actively recruited” new members.
His death is considered a major blow to the jihadist group, which has suffered a series of military reverses in both Syria and Iraq.
Russia’s defence ministry said Adnani was one of up to 40 militants killed in air strikes by the Su-34 bomber.
It said its information had been confirmed “through several intelligence channels”. This is the first time Moscow has said it has killed a key IS leader.
Umm Hawsh is 24km (15 miles) north of Aleppo and 28km west of al-Bab.
Adnani – who was also the group’s spokesman – was “martyred while surveying the operations to repel the military campaigns against Aleppo”, Amaq said, without giving details about how he died.
Fighting has escalated around the city in recent weeks, with rebels breaking a siege by government forces and Syrian and Russian warplanes bombing rebel-held areas.