Cartoonists worldwide pay tribute to Charlie Hebdo

Cartoonists from the US to Algeria onThursday tweeted tributes to their colleagues at Charlie Hebdo who were gunned down by two men claiming to be avenging the prophet Mohammed, the subject of caricatures published by the French satirical paper. Here are some of their drawings as seen on Twitter.

David Pope, press cartoonist Twitter/@davpope

"If God exists, he doesn't kill for a cartoon..." Instagram © Joann Sfar

@asterixofficiel © Uderzo

"The world has become so serious that humour is a dangerous profession"