U.K. Prime Minister David Cameron took to Twitter on Wednesday to condemn the attack on satirical newspaper Charlie Hebdo by masked gunmen.
"The murders in Paris are sickening," Cameron tweeted. "We stand with the French people in the fight against terror and defending the freedom of the press."
Other world leaders expressed similar sentiments about Wednesday's attack, which left 12 people dead. Jean-Claude Junker, president of the European Commission, said the attack was an "intolerable act" of "barbarism." And Angela Merkel, chancellor of Germany, called the attack "despicable."