Cherif Chekatt pledged allegiance to the Daesh* terrorist group in a video, AFP reported Saturday, citing an anonymous judicial source.
According to the source, the investigators had found a USB key with a video, in which the Strasbourg shooter claimed he belonged to Daesh.
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Previously, the organisation claimed responsibility for the Strasbourg shooting, however, French Interior Minister Christophe Castaner called the Daesh claims "opportunistic".
The gunman was neutralised by the French police last week. According to the French Interior Minister, three police officers tried to detain Chekatt, but after he fired at them, the officers responded with fire and killed him.
* Daesh (ISIL/ISIS/IS/Islamic State) is a terrorist organisation banned in Russia