BERLIN—A German rapper who embraced militant Islam and joined jihadists fighting in Syria has reportedly been injured in an airstrike.

The banned Salafist group Millatu Ibrahim said on its website Monday that Denis Cuspert, who now calls himself Abu Talha al-Almani, was injured when a house he was in was attacked by "a fighter jet and a helicopter."

The group didn't specify if it was a Syrian government airstrike but denied reports that al-Almani he had been killed.

Al-Almani was born to a Ghanaian father and a German mother, and performed under the name Deso Dogg before converting to Islam.

German security agencies said al-Almani traveled to Egypt last year shortly after the government banned Millatu Ibrahim for calling on Muslims to fight against Germany's "constitutional order."