An estimated 5,000 people gather at Place de la Republique in support of the victims after the terrorist attack earlier today on January 7, 2015 in Paris, France.

It was France's deadliest postwar terrorist attack.

Charlie Hebdo is displayed in the area as people hold hands and form a circle around the Place de la Republique at midday in solidarity with victims of yesterday's terrorist attack in Paris, France, Jan. 8, 2015.

Twelve people were killed including two police officers as two gunmen opened fire at the offices of the French satirical publication Charlie Hebdo on January 7.

People hold candles next to prints reading "I am Charlie" during a vigil to pay tribute to the victims of a shooting by gunmen at the offices of weekly newspaper Charlie Hebdo in Paris, at the Kennedy Park in Lima, January 7, 2015.

A placard that reads "I am Charlie" is placed next to a candle during a campaign at a bookstore in Beijing for victims of the shooting at the Paris offices of weekly satirical newspaper Charlie Hebdo, Jan. 8, 2015.

British newspapers display headlines connected to the killing of journalists and police in Paris in London, England, Jan. 8, 2015.

Thousands of people gather for a moment of silence to pay their respects to the victims of the deadly attack at the Paris offices of French satirical newspaper Charlie Hebdo, in Lyon, central France, Jan. 7, 2015.

People gather around candles and pens at the Place de la Republique in support of the victims after the terrorist attack earlier today on January 7, 2015 in Paris, France.

A woman raises a pen as another 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, Jan.7, 2015.

Amandine Marbach from Strasbourg, France, lights a candle as she takes 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, in the Manhattan borough of New York January 7, 2015.

The sign reads "I am Charlie".

A man raises a pen during a rally in support of the victims of a terrorist attack on French satirical newspaper Charlie Hebdo at the Place de la Republique in Paris Jan. 7, 2015.

Gunmen killed at least 12 people in the attack, France's deadliest in decades.

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 Jan. 7, 2015.

A sign reading "We are all Charlie Hebdo" is placed by embassy personnel at the front gate of the French Embassy in Washington, D.C., Jan. 7, 2015.

People hold front pages of newspaper Charlie Hebdo while taking part in a rally to show their solidarity with the victims of the terrorist attack on the French satirical newspaper at the Place de la Republique in Paris Jan. 7, 2015.

Journalism students hold a banner reading in French "Journalism students: Solidarity" as they raise pens during a gathering at the Place de la Republique in Paris Jan. 7, 2015, following an attack by unknown gunmen on the offices of the satirical weekly Charlie Hebdo.

People gather in Toulouse, France, Jan. 7, 2015, to show their solidarity for the victims of the attack by unknown gunmen on the offices of the satirical weekly Charlie Hebdo.

A woman holds a candle and a poster reading "Je suis Charlie" (I am Charlie) during a spontaneous vigil in front of the French Embassy in Berlin, Germany, to express solidarity with employees of the French satirical weekly Charlie Hebdo that was the target of an attack by unknown gunmen Jan. 7, 2015.

German Chancellor Angela Merkel condemned the "despicable" attack that left at least 12 people dead in a condolence letter to President Francois Hollande.

People gather in front of the city hall of Rennes, France, Jan. 7, 2015, following an attack by unknown gunmen on the offices of the satirical weekly Charlie Hebdo.

France's Muslim leadership sharply condemned the shooting at the Paris satirical weekly that left at least 12 people dead as a "barbaric" attack and an assault on press freedom and democracy.

People walk past flowers of condolence placed at the French Embassy at Pariser Platz in Berlin, Germany, Jan. 7, 2015.

Hooded gunmen stormed the Paris offices of Charlie Hebdo, a weekly satirical newspaper known for lampooning radical Islam, killing at least 12 people, including two police officers in the worst militant attack on French soil in decades.

A man holds a placard reading "Je suis Charlie" (I am Charlie) to pay tribute during a gathering at the Place de la Republique in Paris Jan. 7, 2015.

A person holds a placard which reads "Charb mort libre" (Charb died free), a reference to slain Charlie Hebdo chief editor Stephane Charbonnier, to pay tribute during a gathering at the Place de la Republique in Paris Jan. 7, 2015.

A person holds a candle in front a placard reading "Je suis Charlie" (I am Charlie) to pay tribute during a gathering at the Place de la Republique in Paris, Jan. 7, 2015.