(CNN) -- ISIS spokesman Mohammad al-Adnani has been killed, according to the terror group's Amaq news agency and a statement from the group Tuesday.

It is unprecedented for ISIS and its news wing to make such an announcement, and al-Adnani's death marks the highest-profile killing among the terror group.

    The Amaq statement said al-Adnani died while inspecting military operations in the area of Aleppo, Syria. ISIS has not revealed the cause of death.

    Representatives of the US-led coalition against ISIS have not commented on the reported death of al-Adnani.

    In January, al-Adnani was reported injured in a coalition airstrike.

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