Postpublished at 11:54 Greenwich Mean Time 7 January 2015
The assault happened late in the morning local time, when masked gunmen entered the building, and began shooting with automatic weapons - reports speak of up to 50 shots being fired.
Gunmen have attacked the offices of French magazine Charlie Hebdo in Paris, killing 12 people including the editor and celebrated cartoonists
The hunt is on for three suspects, named by police as Hamyd Mourad and brothers Said Kouachi and Cherif Kouachi.
It is the deadliest terror attack in France since 1961 during the Algerian war
President Hollande said it was an act of "extreme barbarity", with many foreign leaders also condemning the attack
In 2011, the satirical publication was firebombed after naming the Prophet Muhammad as its "editor-in-chief"
Mohamed Madi, Sherie Ryder, Julia Macfarlane, Alastair Beach and Victoria Park
The assault happened late in the morning local time, when masked gunmen entered the building, and began shooting with automatic weapons - reports speak of up to 50 shots being fired.
Five of the 10 people injured are in a critical condition, police say.
The British Prime Minister, David Cameron, has tweeted, external to condemn the attack: "The murders in Paris are sickening. We stand with the French people in the fight against terror and defending the freedom of the press."
Ten people are wounded in the attack, police say.
During the shoot-out some of the magazine's staff took shelter on the roof of the building, the International Business Times, external reported.
This picture has been posted on social media from near the scene, showing bullet holes in a police vehicle.
A victim is evacuated on a stretcher after the attack on the Hebdo offices.
Paris has been put on maximum alert following the attack, officials say.
@Hellawyn tweets, external: People who hate the press also hate freedom. They are absolutely crazy. Killing in the name of intolerance is shocking! #CharlieHebdo
The BBC's Lucy Williamson in Paris says that witnesses spoke of sustained gunfire at the Hebdo office as the attackers opened fire with Kalashnikov assault rifles.
Other French media outlets have been warned by police to be on alert and pay attention to security following shooting at Charlie Hebdo, BBC in Paris reports
Twelve people are killed in the attack, police say.
This was the scene near the Charlie Hebdo a short while ago.
President Francois Hollande is to visit the magazine's offices shortly, officials say.
Police official Luc Poignant says that it is a scene of "carnage" at the Hebdo offices.
@ImadMesdoua tweets, external: #France press already making implicit links between #CharlieHebdo's Islamic caricature controversy and today's attack. Everyone chill: wait!
"About a half an hour ago two black-hooded men entered the building with Kalashnikovs (guns)," Benoit Bringer told France Info radio. "A few minutes later we heard lots of shots," he said, adding that men were then seen fleeing the building.
The offices of Charlie Hebdo have been attacked before. In 2011, they were petrol-bombed soon after naming the Prophet Muhammad as its "editor-in-chief" for its next issue.
Ten people are killed in the attack, Paris prosecutor says.