Gunmen shoot a wounded police officer (R) on the ground at point-blank range, outside the offices of French satirical newspaper Charlie Hebdo in Paris, in this still image taken from amateur video shot on January 7, 2015, and obtained by Reuters. Hooded gunmen stormed the Paris offices of the weekly satirical magazine known for lampooning radical Islam, killing at least 12 people, including two police officers in the worst militant attack on French soil in recent decades. (Photo by Reuters/Handout via Reuters TV)

Gunmen flee after shooting a wounded police officer (L) on the ground at point-blank range, outside the offices of French satirical newspaper Charlie Hebdo in Paris, in this still image taken from amateur video shot on January 7, 2015, and obtained by Reuters. (Photo by Reuters/Handout via Reuters TV)

Gunmen flee the offices of French satirical newspaper Charlie Hebdo in Paris, in this still image taken from amateur video shot on January 7, 2015, and obtained by Reuters. (Photo by Reuters/Handout via Reuters TV)

Gunmen have attacked the Paris office of French satirical magazine Charlie Hebdo, killing 12 people and injuring seven on January 7, 2015. A major police operation is under way in the Paris area to catch the killers. (Photo by Panoramic/Zuma Press/TNS)

Police are seen during an operation in the “Croix-Rouge” suburb of Reims, northern France early January 8, 2015 following the attack on satirical weekly Charlie Hebdo that left 12 dead in Paris. French police are hunting three men, including two brothers, suspected of carrying out the attack, a source close to the investigation told AFP. Police are searching for two brothers in their thirties, including one who was sent to prison in 2008 for participating in jihadist networks attempting to send fighters to Iraq. The third suspect is aged 18, the source added. (Photo by Francois Nascimbeni/AFP Photo)

This photo provided by The Paris Police Prefecture Thursday, January 8, 2015 shows the suspects Cherif, left, and Said Kouachi in the newspaper attack along with a plea for witnesses. Police hunted Thursday for two heavily armed men, one with possible links to al-Qaida, in the methodical killing of 12 people at a satirical newspaper that caricatured the Prophet Muhammed. France began a day of national mourning for what its president called “an act of exceptional barbarism”. (Photo by AP Photo/Prefecture de Police de Paris)

People react as they are evacuated outside the French satirical newspaper Charlie Hebdo's office, in Paris, Wednesday, January 7, 2015. Masked gunmen shouting “Allahu akbar!” stormed the Paris offices of the satirical newspaper Charlie Hebdo, killing 12 people, including the paper's editor and a cartoonist, before escaping in a getaway car. It was France's deadliest terror attack in at least two decades. (Photo by Francois Mori/AP Photo)

French soldiers patrol near the Eiffel Tower in Paris as part of the highest level of "Vigipirate" security plan after a shooting at the Paris offices of Charlie Hebdo January 7, 2015. Gunmen stormed the Paris offices of the weekly satirical magazine Charlie Hebdo, renowned for lampooning radical Islam, killing at least 12 people, including two police officers in the worst militant attack on French soil in recent decades. The French President headed to the scene of the attack and the government said it was raising France's security level to the highest notch. (Photo by Gonzalo Fuentes/Reuters)

Policemen work at the scene after a shooting at the Paris offices of Charlie Hebdo January 7, 2015. (Photo by Youssef Boudlal/Reuters)

French President Francois Hollande (C) arrives after a shooting at the Paris offices of Charlie Hebdo, a satirical newspaper, January 7, 2015. Eleven people were killed and 10 injured in shooting at the Paris offices of the satirical weekly Charlie Hebdo, already the target of a firebombing in 2011 after publishing cartoons deriding Prophet Mohammad on its cover, police spokesman said. Five of the injured were in a critical condition, said the spokesman. Separately, the government said it was raising France's national security level to the highest notch. (Photo by Christian Hartmann/Reuters)

Jean-Luc Melenchon, member of the French far-left Parti de Gauche, speaks to the media as he arrives at the scene after a shooting at the Paris offices of Charlie Hebdo January 7, 2015. The French President headed to the scene of the attack and the government said it was raising France's security level to the highest notch. (Photo by Charles Platiau/Reuters)

French policemen stand next to funeral hearse in front of the entrance of the Paris offices of Charlie Hebdo after a shooting January 7, 2015. (Photo by Charles Platiau/Reuters)

A distressed woman is assisted by firemen near the scene after a shooting at the Paris offices of Charlie Hebdo, a satirical newspaper, January 7, 2015. (Photo by Christian Hartmann/Reuters)

Police investigators examine the impacts from machine gun fire on the front of a police vehicle in the street near the Paris offices of Charlie Hebdo, a satirical newspaper, after a shooting January 7, 2015. (Photo by Christian Hartmann/Reuters)

Police and rescue forces are seen near the scene after a shooting at the Paris offices of Charlie Hebdo, a satirical newspaper, January 7, 2015. (Photo by Christian Hartmann/Reuters)

Policemen look at a bullet impact on a car after a shooting at the Paris headquarters of satirical weekly Charlie Hebdo, January 7, 2015. (Photo by Philippe Wojazer/Reuters)

French policemen stand next to funeral hearse in front of the entrance of the Paris offices of Charlie Hebdo after a shooting January 7, 2015. (Photo by Philippe Wojazer/Reuters)

French soldiers patrols next to the Eiffel Tower after a shooting at a French satirical newspaper, in Paris, France, Wednesday, January 7, 2015. (Photo by Christophe Ena/AP Photo)

A victim is evacuated on a stretcher on January 7, 2015 after armed gunmen stormed the offices of the French satirical newspaper Charlie Hebdo in Paris. (Photo by Martin Bureau/AFP Photo)

Firefighters carry an injured man on a stretcher in front of the offices of the French satirical newspaper Charlie Hebdo in Paris on January 7, 2015, after armed gunmen stormed the offices leaving at least one dead according to a police source and “six seriously injured” police officers according to City Hall. (Photo by Philippe Dupeyrat/AFP Photo)

An injured person is evacuated outside the French satirical newspaper Charlie Hebdo's office, in Paris, Wednesday, January 7, 2015. Police official says 11 dead in shooting at the French satirical newspaper. (Photo by Thibault Camus/AP Photo)

Police forces gather in street outside the offices of the French satirical newspaper Charlie Hebdo in Paris on January 7, 2015, after armed gunmen stormed the offices leaving at least 10 people dead according to prosecutors. (Photo by Martin Bureau/AFP Photo)

Firefighters carry an injured man on a stretcher in front of the offices of the French satirical newspaper Charlie Hebdo in Paris on January 7, 2015. (Photo by Martin Bureau/AFP Photo)

A victim is evacuated on a stretcher on January 7, 2015 after armed gunmen stormed the offices of the French satirical newspaper Charlie Hebdo in Paris. (Photo by Martin Bureau/AFP Photo)

French and European flags fly at half-mast outside the National Assembly in Paris January 7, 2015, following a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo. (Photo by Jacky Naegelen/Reuters)

Nicolai Wammen, Danish Minister of Defence, lights a candle in front of the French Embassy in Copenhagen, January 7, 2015, following a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris. At left is French Ambassador Francois Zimeray. (Photo by Erik Refner/Reuters/Scanpix Denmark)

A placard which reads “I am Charlie” is pictured as people gather to pay tribute to the victims of a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, in front of the European Parliament in Brussels January 7, 2015. (Photo by Francois Lenoir/Reuters)

People gather to mourn for the victims in front of the Brandenburg Gate near the French embassy at Pariser Platz in Berlin January 7, 2015, following a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris. (Photo by Fabrizio Bensch/Reuters)

A woman cries during a vigil to pay tribute to the victims of a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, at Trafalgar Square in London January 7, 2015. (Photo by Stefan Wermuth/Reuters)

People try to light candles to form the word "Charlie" to pay tribute to the victims of a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, in front of the European Parliament in Brussels January 7, 2015. Gunmen stormed the Paris offices of the weekly satirical magazine Charlie Hebdo, renowned for lampooning radical Islam, killing at least 12 people, including two police officers in the worst militant attack on French soil in recent decades. (Photo by Francois Lenoir/Reuters)

A woman holds a placard that reads, “I am Charlie”, during a vigil to pay tribute to the victims of a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, at Trafalgar Square in London January 7, 2015. (Photo by Stefan Wermuth/Reuters)

French President Francois Hollande delivers a speech at the Elysee Palace after a shooting at the Paris headquarters of satirical weekly Charlie Hebdo killing at least 12 people and injuring many, January 7, 2015. (Photo by Philippe Wojazer/Reuters)

People take part in a vigil to pay tribute to the victims of a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, at Trafalgar Square in London January 7, 2015. (Photo by Stefan Wermuth/Reuters)

People hold candles as they pay tribute to the victims of a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, in front of the European Parliament in Brussels January 7, 2015. (Photo by Francois Lenoir/Reuters)

People light candles in tribute to the victims of a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, outside the French embassy in Stockholm, January 7, 2015. (Photo by Claudio Bresciani/Reuters/TT News Agency)

A man holds up a tablet with an image that reads “wholeheartedly with Charlie Hebdo” during a tribute to the victims of a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, at France's Embassy in Buenos Aires January 7, 2015. (Photo by Marcos Brindicci/Reuters)

A woman holds a sign during a vigil to pay tribute to the victims of a shooting by gunmen at the offices of weekly satirical magazine Charlie Hebdo in Paris, at Trafalgar Square in London January 7, 2015. (Photo by Suzanne Plunkett/Reuters)

People holds a Charlie Hebdo frontpage (L) and a picture of late French cartoonist Charb reading “together against barbarism” during a gathering in Toulouse on January 7, 2015, in solidarity for the victims of the attack by unknown gunmen on the offices of the satirical weekly, Charlie Hebdo. (Photo by Eric Cabanis/AFP Photo)

Journalists hold placard reading “I am Charlie” as they hold a minute of silence, on January 7, 2015 at the redaction of French news agency Agence France Presse, following the attack by gunmen in the offices of the French satirical weekly Charlie Hebdo. (Photo by Bertrand Guay/AFP Photo)

People gather at the Place Royale in Nantes on January 7, 2015, to show their solidarity for the victims of the attack by unknown gunmen on the offices of the satirical weekly, Charlie Hebdo. Heavily armed gunmen massacred 12 people on Wednesday after bursting into the Paris offices of a satirical weekly that had long outraged Muslims with controversial cartoons of the prophet Mohammed. (Photo by Georges Gobet/AFP Photo)

Pakistani newspapers carry headlines reporting about Wednesday's attack on a satirical newspaper in Paris, at a news stand in Islamabad, Pakistan, Thursday, January 8, 2015. Police hunted Thursday for two heavily armed men, one with possible links to al-Qaida, in the methodical killing of 12 people at the Charlie Hebdo that caricatured the Prophet Muhammed. The prime minister said the possibility of a new attack “is our main concern” and announced several overnight arrests. (Photo by B. K. Bangash/AP Photo)

A cartoon style drawing hangs outside France's embassy that reads in Spanish “The pencil is the most peaceful weapon, don't mess with humor” in solidarity with those killed in an attack at the Paris offices of the weekly newspaper Charlie Hebdo in Buenos Aires, Argentina, Wednesday, January 7, 2015. (Photo by Natacha Pisarenko/AP Photo)

Flowers and pens and placards lie after being placed to show solidarity with those killed in an attack at the Paris offices of weekly newspaper Charlie Hebdo, in Trafalgar Square, London, Thursday, January 8, 2015. Masked gunmen stormed the Paris offices of a weekly newspaper that caricatured the Prophet Muhammad, methodically killing 12 people Wednesday, including the editor, before escaping in a car. It was France's deadliest postwar terrorist attack. (Photo by Kirsty Wigglesworth/AP Photo)

A woman holds up her hands bearing the words “Not afraid” in French during a gathering in solidarity of the victims of a terror attack against French satirical newspaper Charlie Hebdo in Paris, Wednesday, January 7, 2015. (Photo by Thibault Camus/AP Photo)

A woman reads the front pages of newspapers hanging from a kiosk, following the Wednesday's attack of Charlie Hebdo newspaper, in Athens, on Thursday, January 8, 2015. Banner headlines clockwise from the top-left read: “The freedoms of Europe are targeted”, “I am Charlie” in French, “Pens beat bullets”, “Bullets in Paris, terror in Europe”, “Blood and terror in the heart of Europe”, “Horror in Paris the cold-blooded murder of freedom of speech”. The paper on bottom left does not have the issue on its front page. (Photo by Petros Giannakouris/AP Photo)

Journalists of international press agency Agence France-Presse (AFP) hold signs reading "Je suis Charlie" (I am Charlie) at their headquarters in Paris as they observe a minute of silence on January 8, 2015 for the victims of an attack by armed gunmen on the offices of French satirical newspaper Charlie Hebdo in Paris on January 7 which left at least 12 dead and many others injured. France observed a minute of silence Thursday, broken only by church bells, in honour of the 12 people killed by apparent jihadists at a magazine known for publishing cartoons deemed offensive to Islam. At midday (11:00 GMT), crowds of people stood silently in public squares, schools and outside official buildings. Bells tolled at Paris' Notre Dame cathedral and in churches across the country. (Photo by Francois Xavier Marit/AFP Photo)

A tribute to the people killed at Paris offices of weekly newspaper Charlie Hebdo, is fixed to the wall outside the French Embassy in London, Thursday, January 8, 2015. Masked gunmen stormed the Paris offices of a weekly newspaper that caricatured the Prophet Muhammad, methodically killing 12 people at the offices of the Charlie Hebdo, Wednesday, including the editor, before escaping in a car. It was France's deadliest postwar terrorist attack. (Photo by Alastair Grant/AP Photo)