At least 10 dead in Paris shooting
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"Charlie's latest tweet was a cartoon of the Islamic State militant group leader, Abu Bakr al-Baghdadi."[2]
[1] http://www.bbc.co.uk/news/world-europe-30710883
[2] https://twitter.com/Charlie_Hebdo_/status/552773881283764224
The Charlie Hebdo magazine had a recurring joke where they printed a Mohammed caricature on the front page as a reaction to being criticized for printing a Mohammed caricature. Actually they were making fun of everyone. But some took it less well than others.
If the French government isn't incredibly sensible in dealing with this issue, this will boost extremist groups on all sides even more.