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Why was the Charlie Hebdo magazine attacked?

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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.

Advice if you're upset by the news