Heavily armed police watch as people arrive at a tribute for the victims of the Paris shootings, in Ottawa

Heavily armed police watch as people arrive at a tribute for the victims of the Paris shootings, in Ottawa

Heavily armed police watch as people arrive at a tribute for the victims of the shootings at the satirical weekly newspaper Charlie Hebdo and a Jewish deli in Paris, in Ottawa January 11, 2015. REUTERS/Chris Wattie (CANADA – Tags: CIVIL UNREST CRIME LAW SOCIETY)