The hacker group, known for its cyber attacks against controversial organisations and individuals, is believed to have uploaded the footage on Friday night.
Islamic State video threatens France day after Paris bloodshed
In the video, an announcer wearing an Anonymous Guy Fawkes mask said 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 [IS],” the group added.
Warning the extremist group, Anonymous said, "Expect massive cyber-attacks. War is declared. Get prepared.”
Praising the resilience of the French the group in its video message said, "The French people are stronger than you and will come out of this atrocity even stronger."
It is still unclear why the video was not shared on the hacktivist group's YouTube channel.
Soon after the video went viral, Anonymous tweeted saying that it has not just declared war on IS, they have been at war with them for quite some time.
Just to be clear: #Anonymous hasn't only just declared war on #IslamicState, we've been at war for quite some time already. #Daesh #ISIS
— Anonymous (@GroupAnon) November 16, 2015
List of almost 1000 #IslamicState twitter accounts: https://t.co/kYBpXRBmMv | #OpISIS #OpParis
— Anonymous (@GroupAnon) November 16, 2015
Under #OpParis, launched following the attack, the group has urged its members to hack into IS websites to steal valuable information and leak it online, Daily Mail reported.
Anonymous has already published a list consisting around 1,000 Twitter accounts linked with Islamic State.
Cyberwar: Anonymous takes down Islamic State websites, social media accounts
To date, according to an in-depth investigation by Foreign Policy, they have taken down 149 Islamic State-related websites and exposed 101,000 Twitter accounts and 5900 propaganda videos.
Earlier this year, the hacktivist group took down websites and social media accounts used by the extremist group Islamic States (IS) in response to the attack on Charlie Hebdo.
The article originally appeared on The Telegraph.
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