It is believed that ISIS is behind the terrorist attack to offices of French satirical weekly Charlie Hebdo on Wednesday which killed at least 12 people.

A cartoon mocking ISIS leader Abu Bakr al-Baghdadi was tweeted by the French magazine Charlie Hebdo just an hour before two gunman burst into their offices and shot dead at least 12 people.

At least 12 people were killed when gunmen armed with Kalashnikovs and a rocket-launcher opened fire in the offices of French satirical weekly Charlie Hebdo on Wednesday.

Footage shot by an eyewitness apparently from the attack shows two armed men dressed in black approach a wounded police officer lying on a pavement. One of the men shot the officer in the head, before both men were seen running back towards a black vehicle and driving away.

Editor-in-chief Stephane Charbonnier, known as Charb, and the cartoonists known as Cabu, Tignous and Wolinski were killed in the attack on the paper, which gained notoriety for repeatedly publishing caricatures of the Prophet Mohammed.

The satirical newspaper gained notoriety in February 2006 when it reprinted cartoons of the Prophet Mohammed (PBUH) that had originally appeared in Danish daily Jyllands-Posten, causing fury across the Muslim world.

Its offices were fire-bombed in November 2011 when it published a cartoon of Prophet Mohammed (PBUH) and under the title "Charia Hebdo".

Despite being taken to court under anti-racism laws, the weekly continued to publish controversial cartoons of the Muslim prophet.

In September 2012 Charlie Hebdo published cartoons of a prophet as violent protests were taking place in several countries over a low-budget film, titled "Innocence of Muslims", which was made in the United States and insulted the Prophet Mohammed (PBUH).