Hacker group Anonymous has declared war against Islamic State in a chilling video uploaded to YouTube, Digital Spy said.
The organisation has vowed revenge for the terror attack that rocked Paris on Friday night (November 13), warning ISIS to "expect us".
"Anonymous from all over the world will hunt you down," said a spokesperson for the hacktivist group, sporting its signature Guy Fawkes mask and speaking in Italian.
"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."
Anonymous, which has reiterated its warning on Twitter, previously targeted ISIS in the wake of the Charlie Hebdo attacks in January.
