Daesh has announced that its spokesman and overseer of external operations, Abu Muhammad al-Adnani, has been killed in Syria’s northern city of Aleppo.

According to Press TV, on Tuesday, the groups’ news outlet, Amaq announced that Adnani was killed “while surveying the operations to repel the military campaigns against Aleppo.”

A US military official was also quoted by Reuters as saying that Adnani was the target of a US strike in the town of al-Bab, but refrained from confirming the terrorist’s death.

Aleppo has been divided between government forces in the west and the Takfiri terrorists in the east over the past four years. Syrian forces have been engaged in a major operation to liberate the terrorist-held parts of the province.

Thirty-nine-year-old Adnani had a $5-million US State Department bounty on his head -- an amount second only to that of the group’s leader Abu Bakr al-Baghdadi.

Adnani was one of the group’s founding members and was reportedly one of its main proponents of launching attacks against Western countries. He also oversaw recruiting and training operations for attacks against Europe. According to the SITE Intel Group, Daesh has threatened revenge over Adnani’s death.

The Takfiri terrorists operating in Syria have suffered major setbacks over the past few months as the Syrian army has managed to liberate several areas.

Syria has been gripped by foreign-backed militancy since March 2011. United Nations Special Envoy for Syria Staffan de Mistura estimates that over 400,000 people have been killed in the conflict in Syria.

The UN has stopped its official casualty count in Syria, citing its inability to verify the figures it receives from various sources.