Following the several deadly terror attacks in Paris on Friday night, famed hacker group Anonymous has declared war against ISIS.
And when Anonymous declares war, it usually means the world can expect a massive leak of personal or sensitive information.
The activist collective has officially begun leaking the personal information of suspected extremists and claims to be responsible for the removal of more than 5,500 Twitter accounts and websites.
According to The Independent, details released include the physical address of a person it claims is an ISIS recruiter in Europe.
In what the group refers to their “biggest operation ever,” it posted a chilling video to YouTube in which a person – wearing the group’s signature mask and speaking in French – said Anonymous would use its knowledge to "unite humanity” and warned the terrorists to "expect us.”
"Anonymous from all over the world will hunt you down,” the spokesperson said, adding, "You should know that we will find you and we will not let you go.”
"Expect massive cyber attacks. War is declared. Get prepared,” the person further threatened. "The French people are stronger than you and will come out of this atrocity even stronger."
On social media, the group is organizing under the hashtags #opISIS and #opParis.
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
At least 129 people were killed in the Friday attacks, while hundreds more were left injured – dozens critically. ISIS quickly claimed responsibility.
France has officially named four of the suicide bombers, and officials are still hunting 26-year-old Salah Abdeslam for his alleged role in the incidents.