The world watched in horror as coordinate attacks in Paris Friday night killed at least 129 people. ISIS has claimed responsibility for these attacks. Following these devastating Paris attacks by terrorists, international hacker group Anonymous have declared war against the ISIS in a video released on YouTube.

In the video, a spokesperson, wearing the traditional Guy Fawkes mask, spoke in French, and said it would use its knowledge to “unite humanity” and warned the terrorists to expect them. “Expect massive cyber attacks. War is declared. Get prepared.”

Here’s the full transcript of the video:

Yesterday, Friday, November 13th 2015, our country, France was attacked in Paris at around 10 PM by multiple terrorist attempts claimed by you, ISIS.

These attacks cannot go unpunished, hence the reason why the anonymous from all over the world will hunt you down as we did since the attacks of Charlie Hebdo. Therefore, be prepared for a massive retaliation from the Anonymous.

Be advised that we will find you and will not let you go; we will launch the biggest ever operative against you.

Expect massive cyber attacks. War is declared. Get prepared.

The French people are stronger than you and will come out of this atrocity even stronger.

Anonymous presents its condolences to the family of all the fallen victims

We Are The Anonymous. We Do Not Forgive, We Do Not Forget.

Expect us.

Make no mistake: #Anonymous is at war with #Daesh. We won’t stop opposing #IslamicState. We’re also better hackers. #OpISIS

— Anonymous (@GroupAnon) November 15, 2015

Evan Kohlmann, an NBC News analyst, has said that the Anonymous operations against ISIS are already underway.

“Anonymous”-affiliated hackers have launched retaliatory attacks on suspected ISIS websites and Twitter accounts in the name of #OpParis.

— Evan Kohlmann (@IntelTweet) November 15, 2015

It isn’t the first time that Anonymous has made threats against ISIS. In January after the Charlie Hebdo attacks, the online activist group promised much of the same retribution. The ‘hacktivists’ run an operation publishing a list of Twitter accounts it claims are spreading propaganda in support of ISIS.