This dreadful catastrophe plunges all France into mourning,

France is mourning,

This mourning deeply marks France as well as every French person who identifies with the message of the Catholic Church.

This dreadful catastrophe plunges all of France into mourning, ... all the consequences can be drawn.

This dreadful disaster plunges all of France into mourning,

France is doing everything it can, but the problem is that it is impossible to stop Bush from pursuing his logic of war to the end.