A French boy residing in Nicaragua holds up a card that reads, “I am Charlie”, to pay tribute to the victims of the shootings in France at the offices of the satirical weekly newspaper Charlie Hebdo and a Jewish deli, in Managua January 10, 2015. (Photo by Oswaldo Rivas/Reuters)

French Gendarmes check a passerby's bag as they secure the access to the solidarity march (Rassemblement Republicain) in the streets of Paris January 11, 2015. French citizens will be joined by dozens of foreign leaders, among them Arab and Muslim representatives, in a march on Sunday in an unprecedented tribute to this week's victims following the shootings by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a police woman in Montrouge, and the hostage taking at a kosher supermarket at the Porte de Vincennes. (Photo by Eric Gaillard/Reuters)

Hundreds of thousands of people gather on the Place de la Republique to attend the solidarity march (Rassemblement Republicain) in the streets of Paris January 11, 2015. (Photo by Charles Platiau/Reuters)

French President Francois Hollande (R) welcomes Germany's Chancellor Angela Merkel as she arrives at the Elysee Palace before the solidarity march (Rassemblement Republicain) in the streets of Paris January 11, 2015. (Photo by Pascal Rossignol/Reuters)

A man holds a pencil as he takes part in a solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Eric Gaillard/Reuters)

French President Francois Hollande is surrounded by head of states including (L to R) European Commission President European Commission President Jean-Claude Juncker, Israel's Prime Minister Benjamin Netanyahu, Mali's President Ibrahim Boubacar Keita, Germany's Chancellor Angela Merkel, European Council President Donald Tusk, Palestinian President Mahmoud Abbas and King Abdullah of Jordan and Queen Rania Al Abdullah as they attend the solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Philippe Wojazer/Reuters)

Policemen secure the hundreds of thousands of French citizens solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Yves Herman/Reuters)

A woman wearing a French national flag holds a “We are Charlie” sign during a march for the victims of the shootings by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo in Paris, in Liverpool, northern England January 11, 2015. (Photo by Phil Noble/Reuters)

French President Francois Hollande is surrounded by heads of state as they attend the solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Philippe Wojazer/Reuters)

A woman holds a sign that reads, “I am Charlie” in Chinese and French, during a protest against terrorism, and in solidarity with the victims of a shooting by gunmen at the Paris offices of the satirical weekly newspaper Charlie Hebdo earlier this week, in Beirut January 11, 2015. (Photo by Jamal Saidi/Reuters)

A woman holds up a placard which reads, “I am Charlie”, as she takes part in a solidarity march in Strasbourg January 11, 2015. (Photo by Vincent Kessler/Reuters)

Citizens carrying a banner which reads, “We are Charlie” take part in a Hundreds of thousands of French citizens solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Eric Gaillard/Reuters)

French President Francois Hollande is surrounded by Heads of state including (LtoR) Germany's Chancellor Angela Merkel, European Council President Donald Tusk, Jordan Queen Rania Al Abdullah and Switzerland's President Simonetta Sommaruga as they attend the solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Yves Herman/Reuters)

A woman holds up a pencil and her phone displaying pictures of the victims of an attack on a kosher supermarket at Porte de Vincennes near Paris, during a rally in Tel Aviv, January 11, 2015, in tribute to this week's victims of the shootings by gunmen at the Paris offices of the satirical weekly newspaper Charlie Hebdo, the killing of a policewoman in Montrouge, and the hostage taking at the supermarket. Israeli Prime Minister Benjamin Netanyahu coupled a show of solidarity with France on Sunday with a reminder to shaken French Jews that Israel is keen to welcome them as immigrants. (Photo by Baz Ratner/Reuters)

French President Francois Hollande is surrounded by heads of state including (LtoR) Germany's Chancellor Angela Merkel, European Council President Donald Tusk and Palestinian President Mahmoud Abbas as they attend the solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Philippe Wojazer/Reuters)

A Man carrying a rod sign reading “Live together” takes part in a Hundreds of thousands of French citizens solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Gonzalo Fuentes/Reuters)

A woman with “I'm Charlie” written on her hand takes part in a Hundreds of thousands of French citizens solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. French citizens will be joined by dozens of foreign leaders, among them Arab and Muslim representatives, in a march on Sunday in an unprecedented tribute to this week's victims following the shootings by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a police woman in Montrouge, and the hostage taking at a kosher supermarket at the Porte de Vincennes. (Photo by Yves Herman/Reuters)

Caricaturist Stavro Jabra holds up his cartoon during a rally held in solidarity with the victims of a shooting by gunmen at the Paris offices of the satirical weekly newspaper Charlie Hebdo earlier this week, in Beirut January 11, 2015. The words on the cartoon read, “Pencil lead is stronger than terrorism”. (Photo by Jamal Saidi/Reuters)

People walk past a grafitti tag reading “I am Charlie” as they take part in a solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Eric Gaillard/Reuters)

Hundreds of thousands of people take part in a solidarity march (Marche Republicaine) in the streets of Lyon January 11, 2015. People in France marched on Sunday in an unprecedented tribute to this week's victims of the shootings by gunmen at the offices of the satirical weekly newspaper Charlie Hebdo, the killing of a policewoman in Montrouge, and the hostage-taking at a kosher supermarket at the Porte de Vincennes. (Photo by Robert Pratta/Reuters)

A general view shows hundreds of thousands of French citizens taking part in a solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Eric Gaillard/Reuters)

A man holds a giant pencil as he takes part in a Hundreds of thousands of French citizens solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Stephane Mahe/Reuters)

A woman wears a tape with the word “Liberte” (Freedom) on her mouth during a silent protest for the victims of the shooting at the Paris offices of weekly newspaper Charlie Hebdo, at the Pariser Platz square in Berlin January 11, 2015. (Photo by Hannibal Hanschke/Reuters)

A woman lights a candle as she takes part in a solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Charles Platiau/Reuters)

The colours of the French national flag are projected in tribute to the victims of the Paris terror attacks, onto The National Gallery in London January 11, 2015. (Photo by Eddie Keogh/Reuters)

A woman lights candles during a tribute for the victims of the shootings at the satirical weekly newspaper Charlie Hebdo and a Jewish deli in Paris, in front of the French embassy in Tel Aviv January 11, 2015. (Photo by Baz Ratner/Reuters)

A man touches the spray-painted shut mouth of a statue near a poster reading “I am Charlie” as he takes part in a solidarity march (Marche Republicaine) in the streets of Paris January 11, 2015. (Photo by Charles Platiau/Reuters)

A woman holds a brush, a pen and a pencil in the colours of the French flag during a tribute for the victims of the shootings at the satirical weekly newspaper Charlie Hebdo and a Jewish deli in Paris, in Ottawa January 11, 2015. (Photo by Chris Wattie/Reuters)

The Empire State Building is lit up in the colors of the French flag to pay tribute to the victims of the shooting by gunmen at the Paris offices of weekly satirical magazine Charlie Hebdo, in the Manhattan borough of New York January 11, 2015. Hooded gunmen stormed the Paris offices of the magazine known for lampooning Islam and other religions, shooting dead at least 12 people, including two police officers, in the worst militant attack on French soil in decades. (Photo by Carlo Allegri/Reuters)

People watch from their roof-top apartment as some thousands of people gather at Republique square in Paris, France, Sunday, January 11, 2015. Thousands of people began filling France's iconic Republique plaza, and world leaders converged on Paris in a rally of defiance and sorrow on Sunday to honor the 17 victims of three days of bloodshed that left France on alert for more violence. (Photo by Peter Dejong/AP Photo)

The crowd walk by a sign “I Am Charlie”, during a rally in Paris, France, Sunday, January 11, 2015. (Photo by Laurent Cipriani/AP Photo)