In response to the attacks in Paris that left over a hundred people dead, hacker group Anonymous have declared war against ISIS.

Posting a video on Youtube soon after the attacks, a person claiming to represent the group behind their signature mask, speaking in French warns members of ISIS:

“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.

“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.”

The video has been watched almost a million times, and thousands of people have shared tweets about Anonymous’s call to action.

This isn’t the first time Anonymous threatens the terrorist group, they made similar threats after the Charlie Hebdo attacks in January, where they take down extremist websites and started running campaigns on social media since then.