Security measures have been heightened as the first post-attack edition of Charlie Hebdo hits newsstands.
Reaction to "Charlie Hebdo"
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Bundestag President Norbert Lammert, German President Joachim Gauck, Chairman of the Central Council of Muslims in Germany Aiman Mazyek and German Chancellor Angela Merkel, link arms during a vigil organized by Muslim groups for the victims of the terror shooting by gunmen at the offices of Charlie Hebdo, in front of the Brandenburg Gate in Berlin, January 13, 2015.