Damaged glass is seen at the site of a shooting in Copenhagen on Saturday. Shots were fired near a meeting in the Danish capital that was attended by controversial Swedish artist Lars Vilks. Scanpix Denmark/Reuters/Landov hide caption

itoggle caption Scanpix Denmark/Reuters/Landov

Police forces gather in street outside the offices of the French satirical weekly Charlie Hebdo in Paris on Wednesday, after armed gunmen stormed the offices. Martin Bereau /AFP/Getty Images hide caption

itoggle caption Martin Bereau /AFP/Getty Images

The Lives of Muhammad book cover hide caption

itoggle caption

At the offices of the French satirical weekly Charlie Hebdo earlier today, publisher/editor Stephane Charbonnier ("Charb") struck a defiant pose. Fred DuFour /AFP/Getty Images hide caption

itoggle caption Fred DuFour /AFP/Getty Images