More evidence that children are being indoctrinated and trained to become jihadists in territories controlled by the Islamic State (Isis) group has emerged in the form of a video showing a little boy learning to shoot and kill.

A child, looking as young as five, is seen firing a pellet gun as he re-enacts a combat scenario running through the streets of a Syrian city, in footage posted online by an activist group.

The blonde-haired boy takes cover behind walls and pauses to reload his weapon acting like an experienced fighter, while another two children and a suspect militant look on.

The video was posted online by Raqqa is Being Slaughtered Silently - a small activist collective which secretly documents the shocking violence and oppression inflicted by the IS on their home city.

Credit: Raqqa is Being Slaughtered Silently