Anonymous declares war on Islamic State after Paris attacks

The hacker collective Anonymous declared war against the Islamic State group Saturday after a series of brutal attacks in Paris on Friday night killed 129 people and injured hundreds more.

In a video posted to YouTube on Nov. 14 a man wearing a Guy Fawkes mask said the group would hunt down the Islamic State militants who claimed responsibility for the Paris attacks.

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“Expect massive cyberattacks. War is declared. Get prepared,” says the masked man in French.

“Anonymous from all over the world will hunt you down. You should know that we will find you and we will not let you go. We will launch the biggest operation ever against you.”

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“We don’t forgive and we don’t forget.”

READ MORE: Who is Abdelhamid Abaaoud? Belgian jihadi ID’d as mastermind of Paris attacks

Anonymous is an international network of activist computer hackers which has claimed responsibility for many cyberattacks, including others on ISIS and the Ku Klux Klan (KKK). Following the January attacks against the offices of the satirical newspaper Charlie Hebdo in Paris they attacked websites related to Islamic State and took down thousands of ISIS twitter accounts.

WATCH: Mohamad Abdeslam, one of the brothers of a dead suicide bomber in the Paris attacks, said on Monday neither he or his family could have imagined that they were involved with the attacks in Paris on Friday evening.

The Islamic State has claimed responsibility for a series of coordinated attacks in Paris where police say attackers worked in three synchronized teams, wearing matching suicide vests and carrying the same weapons laid siege on a stadium, a concert hall and Paris cafes leaving 129 people dead and over 350 wounded, 99 of them seriously.