A massive airstrike on ISIS headquarters is underway in Raqqa, Syria, as the world mourns the loss of more than 120 people. The terrorist group ISIS claimed responsibility for the Paris attacks, which left hundreds of others injured.

As the world unites to take on the terrorist group, hacktivist group Anonymous is also stepping in, warning terrorists that the group is launching “the biggest operation ever,” in an effort to unite humanity and take down terrorists.

“Anonymous from all over the world will hunt you down,” an Anonymous spokesperson says in French. “Expect massive cyber attacks. War is declared. Get prepared.”

The group warned terrorists to “expect us.” Anonymous has claimed to have already taken down ISIS-related websites, and exposed thousands of ISIL supporters on social media.

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Anonymous has also released an English version of the video, with the same message for Isis.

“To defend our values and our freedom, we’re tracking down members of the terrorist group responsible these attacks, we will not give up, we will not forgive, and we’ll do all that is necessary to end their actions,” an Anonymous member declared.

Anonymous’ #OpParis operation has quickly picked up steam and is trending worldwide.