Thousands of people gather during a demonstration march in Lille, France, on Saturday, Jan. 10, 2015, in support of the victims of this week’s twin attacks in Paris. Hundreds of extra troops are being...

Thousands of people gather during a demonstration march in Lille, France, on Saturday, Jan. 10, 2015, in support of the victims of this week’s twin attacks in Paris. Hundreds of extra troops are being...