The deadly attacks in Paris have sparked a debate in Germany on Chancellor Angela Merkel's refugee policy and how to get a better overview of the people entering the country.

Islamic State on Saturday claimed responsibility for the coordinated assault by gunmen and bombers that killed 127 people in Paris. President Francois Hollande said the attacks amounted to an act of war against France.

Merkel said Germany would help France to hunt down the perpetrators and backers of the attacks, promising a joint battle to defend European values.

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