We are horrified to learn of the attack on the offices of the Paris-based satirical magazine Charlie Hebdo. No journalists should face violence for what they publish - and any attack on journalists is an attack on freedom of expression.

When terrorist attacks take place, it's always wise to wait for details to emerge before jumping to conclusions about who is behind them and why.

For now, it's worth stating that journalists should have the right to publish offensive material without fear of violent retribution. They should have the freedom to publish it, and others should have the freedom to criticise it. Let's defend those rights.

One effect that terrorism can have is that it scares large groups of people into hating each other; into endorsing stereotypes and restrictive laws they might otherwise not. Let's resist that too.