Approximately 900 ISIS Twitter accounts have been suspended after Anonymous posted a list of them online.
The internet hacker group have already waged a cyber war on Isis.
The group have displayed a warning message ‘expect us!’ placed above the list of names.
Anonymous wants to ‘unite humanity’ in an effort to bring Isis down after militants took the lives of 129 people on Friday.
While it is easy for ISIS to setup new twitter accounts, each time an account is suspended, the number of followers a person has is likely to be diminished.
Anonymous posted a video which said:
‘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 (@GroupAnon) November 15, 2015