Here's a collection of responses, from official statements to tweets to the new cover of Libération, to Wednesday's killing of 12 at the Paris satirical magazine Charlie Hebdo.

From Libération:

Le Monde's homepage on Wednesday:

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From journalists at RTBF in Belgium:

From journalists at Agence France-Presse:

From journalists at Radio-Canada:

Google's homepage in France:

From the Newspaper Association of America:

More than 250 years ago, the French political philosopher Montesquieu wrote that political liberty, 'is a tranquility of mind arising from the opinion each person has of his safety.' Today, political liberty suffered a horrible blow with the deadly attack at the offices of Charlie Hebdo, a satirical newspaper published in Paris.
The Newspaper Association of America, along with the World Association of Newspapers and News Publishers and other news organizations, condemn these brutal murders. Last year, more than 60 journalists around the world were killed and over 100 kidnapped in the course of doing their jobs. It is a sober reminder of the human cost free societies pay for the liberty they enjoy.
On behalf of our nearly 2,000 member newspapers, we offer condolences to all the families grieving for their loved ones. We recognize and deeply appreciate the contributions that courageous journalists everywhere make every day.

From the BBC, covering rallies in Paris:

At Journalism.co.uk, an interactive map where you can find gatherings in support of Charlie Hebdo journalists:

Moments of silence:

Reporters Without Borders called today Black Wednesday.

Reporters Without Borders is deeply chocked by this deadly attack. "A newsroom attack with machine guns is a type of violence we witness in Irak, Somalia or Pakistan", stated Christophe Deloire, Reporters Without Borders Secretary General at the shooting scene. Could we expect such horror in France? A nightmare that became reality. This terrorist attack marks a black day in the history of France ».

From the Committee to Protect Journalists:

"We are shocked and saddened by the horrific violence perpetrated against the weekly Charlie Hebdo--one of the deadliest media attacks ever documented by CPJ," said CPJ Executive Director Joel Simon from New York. "Around the world, journalists working in their own countries are targeted and killed because of what they publish or broadcast. An attack of this nature in Paris shows that the threat to journalists and free expression is global, with no safe haven."

From Syndicat National des Journalistes, the French journalists' union:

The massacre perpetrated against the editorial staff of Charlie Hebdo is a horror that strikes at us all. When journalists are killed, it is done to make an entire profession feel fear; it is done to silence. Attacking a newspaper is an attempt to muzzle the freedom of expression that exists in a democracy.

Reported.ly has a collection of art made after the shootings and a collection of vigils.

From The Newspaper Guild president, Bernie Lunzer:

We are saddened and angered by the murders at Charlie Hebdo in France. Free speech is a critical value to free people and this slaughter is directly intended to inhibit such speech. We continue to decry impunity in the continued killing of journalists across the globe.

From the Newseum:

The Newseum condemns today's violent attack on the French satirical newspaper Charlie Hebdo in Paris. Journalists around the world fight every day for the right to report the news without fear of reprisal. They express ideas others disagree with and pose questions some don't want asked. Too often they pay the ultimate price. We join with journalists and all others who support freedom of expression to declare that such cowardly attempts to thwart free speech and a free press will not succeed, and that this most recent attack only strengthens our commitment to the ideal that all people in every nation should be able to express themselves freely and without fear.

Tonight, the Newseum will project #JeSuisCharlie on its 40-by-22-foot atrium screen, in solidarity with Charlie Hebdo and free expression everywhere.

From the Society of Professional Journalists:

The Society of Professional Journalists is angered by today’s attack on French satirical magazine Charlie Hebdo in Paris. This is a barbaric, appalling attempt to stifle press freedom.

Extremists feel emboldened to attack and kill journalists anywhere in the world for lampooning religion or reporting on political and governmental activities. Such outrageous attempts to silence journalists will not be tolerated or successful.

From the National Society of Newspaper Columnists:

“A journalist’s most important and powerful tools are words, but even they are inadequate in expressing the horror we at the National Society of Newspaper Columnists feel about the attack on the staff of the satirical newspaper Charlie Hebdo. It also was an attack on freedom — and free speech — everywhere.

“Thomas Jefferson said, ‘The only security of all is a free press. The force of public opinion cannot be resisted when permitted freely to be expressed.’

“We could not agree more. Let us all have the courage to speak freely and to resist those who would prevent us from doing so.”

From the Online News Association's statement:

Yesterday’s murders at the magazine Charlie Hebdo in Paris were not just an attack on journalism, they were yet another declaration of open warfare on free speech.

Journalists who take on extremism and report on the abuses of power are a flash point for violence, and the past year has been an extraordinarily brutal reminder.

I've also gathered a list of journalists reporting now from Paris, and a collection of political cartoons. Here's today's morning newsletter, with the story as it began unfolding.