Recently, the French satirical newspaper, Charlie Hebdo was attacked by masked gunmen armed with AK-47s, who stormed into the newspaper office and killed 12 people, including top journalists and two policemen.

The masked gunmen, who stormed into the office, had opened fire during a morning editorial meeting where the two policemen were killed among the other journalists, according to Independent.

One of the armed militants was captured on video, shouting "Allahu Akbar!" ("God is Great") before the group of masked attackers fled the scene. A witness from nearby, apparently saw the attack from a nearby building, according to France Info, the local radio station.

Although no terrorist outfit has claimed responsibility for the brutal attacks, other extremist groups were quick to applaud the act and express their affirmations though their respective Twitter accounts.

Many such groups labeled the attack as revenge for subjecting Islam and their Prophet to such stark satire.

The newspaper had mocked ISIS and tweeted a cartoon picture of the group's leader, Abu Bakr al-Baghdadi, a few days before the attack took place. Last year, the newspaper depicted a cartoon picture of the Islam Prophet Muhammad naked and crouching. These pictures, many news agencies speculate are the reason behind the attack.

In the wake of this tragic incident, President Francois Hollande has declared a day of mourning and said that the attack was an act of terrorism and an assault on freedom of the press.