It isn't hard to stream burning liquid on things.
What's amazing to me is they are allowed to continue to do it.
They should be shot on sight.
That would bring things to a halt real fast.
But dead Muslims on TV just might cause serious trouble for French citizens in Muslim countries around the world...
You're right.
I have learned that the French include Molotov Cocktail as one particular sort of "engin incendiaire", so that's probably what they mean here.