According to the US-based online monitoring news magazine Site, the group said that the assault on Charlie Hebdo would not be a one-off incident.
Fourteen people, including three in absentia, face various charges for helping to organise the attacks that left 17 people dead in the Paris region.
Saïd Kouachi and his brother, Chérif, as well as Amédy Coulibaly died in shootouts with police after a three-day rampage targeting Charlie Hebdo, police officers and the kosher supermarket Hyper Cacher.
If found guilty, the accused face la range of sentences including life in prison for complicity in terrorism, 20 years for complicity in a terrorist enterprise or a 10 year term for complicity in organised crime.
The trial, which started on 2 September, is expected to end in November.
