In Paris, tens of thousands of people have been protesting about the importance of free speech. So why is this happening?
France is holding a day of national mourning. Today at midday the whole country held a minute's silence.
It's to pay tribute to those who lost their lives in a horrific attack on a the office of a magazine in Paris, on Wednesday. Twelve people were shot and killed.
Hayley explains why this attack is being seen as an attack on freedom of speech, around the world.