German President Joachim Gauck gives a speech in front of Berlin's Brandenburg Gate as political and religious leaders attend a Muslim rally to condemn the Paris terror attacks, promote tolerance and send a rebuke to a growing anti-Islamic movement on Tuesday, January 13. Tobias Schwarzia/AFP/Getty
The Empire State Building in New York is lit in the colors of the French flag on January 11, paying tribute to those who lost their lives in the Charlie Hebdo terrorist attack. TIMOTHY A. CLARY/AFP/Getty Images
A man holds up a pen, signifying freedom of expression, during a gathering Friday, January 9, at JFK Plaza in Philadelphia. Matt Rourke/AP
Lights on the Arc de Triomphe say "Paris est Charlie" (Paris is Charlie) on January 9. MATTHIEU ALEXANDRE/AFP/Getty Images
Journalists and other people in Hong Kong hold up pens and hold signs that say "Je suis Charlie" (I am Charlie) during a vigil on January 9. Lucas Schifres/Getty Images
Workers install a giant banner on the Cannes Festival Palace in Cannes, France, on January 9. Lionel Cironneau/AP
People gather in front of the French Embassy in Mexico City on Thursday, January 8. Manuel Velasquez/Anadolu Agency/Getty Images
A crowd gathers in Sydney on January 8 to show their support for Charlie Hebdo. Wolter Peeters/Fairfax Media/Getty Images
In remembrance of the victims, the Eiffel Tower goes dark on January 8. Aurelien Meunier/Getty Images
A man holds a pencil in front of Notre-Dame Cathedral during a moment of silence January 8 in the French capital. MATTHIEU ALEXANDRE/AFP/Getty Images
Police observe a moment of silence January 8 in Rennes, France. DAMIEN MEYER/AFP/Getty Images
People in Istanbul pay tribute to the victims of the attack on January 8. BULENT KILIC/AFP/Getty Images
Journalists and supporters of press freedom hold placards saying "I am Charlie" outside the Foreign Correspondents' Club in Hong Kong on January 8. AP Photo/Vincent Yu
Women hug each other during a solidarity rally outside the office of Charlie Hebdo on January 8. Francois Mori/AP
A Romanian military member walks past a condolence book outside the French Embassy in Bucharest, Romania, on January 8. DANIEL MIHAILESCU/AFP/Getty Images
People in Toulouse, France, observe a moment of silence in front of City Hall on January 8. REMY GABALDA/AFP/Getty Images
French journalists and their families show solidarity with the Paris victims outside the French Embassy in New Delhi on January 8. Saurabh Das/AP
Mourners hold signs depicting victims' eyes during a rally in New York on Wednesday, January 7. John Minchillo/AP
People hold candles during a gathering at Place de la Republique, a square in Paris, on January 7. Carolina Arantes
People gather in Paris on January 7. Thibault Camus/AP
Flowers are placed at a candlelight vigil near the French Embassy in Tunis, Tunisia, on January 7. MOHAMED MESSARA/EPA/LANDOV
People in Rio de Janeiro hold a sign that reads "We're all Charlie" on January 7. Leo Correa/AP
Papers with "I am Charlie" written in various languages are left near candles at a vigil in front of the French Embassy in Berlin. Carsten Koall/Getty Images
Employees put up a sign as a woman prepares to place a bouquet of flowers at the front gate of the French Embassy in Washington on January 7. Alex Wong/Getty Images
People in Brussels, Belgium, hold candles during a vigil on January 7. Geert Vanden Wijngaert/AP
People gather near candles in Lyon, France, on January 7. Laurent Cipriani/AP
People in Paris hold candles on January 7. Thibault Camus/AP
A man holds a candle and a sticker that translates to "I am Charlie" during a vigil in Paris on January 7. Christophe Ena/AP
People gather in London's Trafalgar Square on January 7. LEON NEAL/AFP/Getty Images
People gather in front of city hall in Rennes on January 7. DAMIEN MEYER/AFP/Getty Images
A portrait of French cartoonist Georges Wolinski, another victim of the shooting, is seen in Marseille, France, on January 7. BORIS HORVAT/AFP/Getty Images
People hold up pens as a show of support in Rennes on January 7. DAMIEN MEYER/AFP/Getty Images
People light candles during a vigil in Geneva, Switzerland, on January 7. MARTIAL TREZZINI/EPA/LANDOV
Journalists with Agence France-Presse hold signs reading "I am Charlie" as they observe a minute of silence on January 7. BERTRAND GUAY/AFP/Getty Images
A man in Paris raises a pen on January 7. MARTIN BUREAU/AFP/Getty Images
People gather at the Place Royale in Nantes, France, on January 7. GEORGES GOBET/AFP/Getty Images
The French national flag flies at half-staff on the roof of the French Embassy in Berlin. FELIX ZAHN/EPA/LANDOV
People light candles at the Place de la Republique on January 7. MARTIN BUREAU/AFP/Getty Images
People hold signs during a gathering in Paris on January 7. DOMINIQUE FAGET/AFP/Getty Images