Another day, another video of the gunmen who attacked the offices of Charlie Hebdo, right?

I’m sure you have, by now, seen the video of the police officer getting killed whilst lying prone on the ground after being shot. If not, click HERE.

Well there is something really chilling about the latest video to emerge, filmed from another rooftop apartment across from the magazine’s offices.

I find the calm with which these gunmen return to their car after slaughtering 11 people incredibly unnerving. This from Sky:

The pair reload their weapons, before one shouts: “We have avenged the Prophet Mohammed, we have killed Charlie Hebdo.”

They then engage in a Grand Theft Auto style shootout with a police car.

Check out the above video taken from the Daily Mail.