At least 12 people have died in Paris after masked gunmen opened fire in the headquarters of Charlie Hebdo, a provocative satirical newspaper.

Among the dead: Some of France’s best-known cartoonists. According to the AFP, they included editor in chief Stephane Charbonnier, a.k.a. “Charb,” and the cartoonists known as Cabu, Tignous and Wolinski.

The reaction to their deaths was swift and intense from their peers.

The French newspaper Le Monde posted a simple image expressing solidarity with the magazine. It reads: “Our hearts are with Charlie Hebdo.”

Another, from Australian cartoonist David Pope:

This was Dutch cartoonist Joep Bertrams’s response:

French graphic designer Jean Jullien adapted the hashtag #JeSuisCharlie to show support:

American cartoonist Macleod’s response:

More:

Some readers might ask why this post excludes a cartoon that’s being widely circulated as a response to the attacks. While it certainly resonates today, the Michael Shaw cartoon, simply a blank panel promising to be a totally nonoffensive cartoon, is actually from 2006:

RELATED: American cartoonists condemn today’s attack, hail slain satirists as ‘heroes’

After Charlie Hebdo attack, U.S. Catholic group says cartoonists ‘provoked’ slaughter

Parisians flocked to Place de la Republic for a silent vigil, as the country reels from the worst attack on French soil in recent decades. (Reuters)

[This post has been updated to reflect the correct publication date of the Michael Shaw cartoon. It was originally published in 2006, not 2012.]