At least 12 people have been killed and many others seriously injured after three gunmen stormed the Parisian office of satirical French magazine Charlie Hebdo.
Two policemen were among the dead. Earlier today, both David Cameron and French president François Hollande condemned the shootings. It was the deadliest terrorist attack in France for decades.
The attack seems to have been carefully planned as Wednesday morning is the only time in the week the magazine hold an editorial meeting.
A car, which was thought to have been used for the crime, has been found outskirts of Paris and the manhunt for the attackers has begun.
The magazine has said it has plans to publish next week and its website remains up.
It has history of controversy. The most similar magazine in the UK is Private Eye.
London Live's Jake Tupman was at a vigil held at Trafalgar Square, where thousands of people arrvied to express solidarity with Parisians. The solemn event saw many in tears.