The "Bundestag" is Germany's main legislative body. Its over 600 members are elected every four years in a mixed system of constituency and list voting.
All legislation has to pass first the Bundestag and then the Bundesrat, the upper house. The Bundestag is located in Berlin in the "Reichstag" building near the Brandenburg Gate.
Bundestag president Norbert Lammert has praised the country's "sober" reaction following the Berlin attack, in which 12 people died and around 50 injured. The attack spurred debate around Germany's security apparatus.
Martin Schulz has decided not to make an attempt at becoming the Social Democrats candidate for chancellor. Is the move only to clear the way for Sigmar Gabriel to run against Chancellor Merkel or is there more to it?