What are your thoughts on the terrorist attack at Charlie Hebdo?

It happened earlier today in my country.
https://uk.news.yahoo.com/paris-shooting---ten-people-killed--at-charlie-hebdo-office-114026330.html#SwtaPyq
They killed french legends. It's basically like, they are trying to tell us that we don't have the right to express our opinion. What are your thoughts?
Update: I'd like to say that they were muslim yes, but that we shouldn't put them all in the same bag. We all have stupid people in each religion. These men were killed for stating what everyone thought. Muslims are embarassed of what these two men did.
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