ISIS calls Anonymous 'idiots' as cyber war heats up
Anonymous, the hacktivist group, has declares war on ISIS and to that end claims to have taken down 5500 ISIS Twitter sites to date; ISIS says that Anonymous are 'idiots'. "Operation ISIS", as the Anonymous campaign is called, can be followed on Twitter at #opParis and #opISIS.

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Anonymous has begun leaking the personal information of suspected extremists, after it "declared war" on Isis in the wake of the deadly attacks in Paris.

The activist collective is assembling lists of the Twitter accounts and websites of extremists, in an attempt to have them taken down. At least one post seen by The Independent contains details including the physical address of a person it claims is an Isis recruiter in Europe.

Activists claim to have successfully had accounts and sites taken down already. Accounts associated with the group claimed that it was responsible for the removal of more than 5,500 accounts.

The group appears to have stepped up its tactics for what it called its "biggest operation" ever, in response to the attacks that left 129 dead. Previously it had largely focused on social media accounts.

None of the details that have been shared could be independently confirmed, and Anonymous activists have wrongly identified alleged extremists in the past. But if true the details shared include the physical addresses and names of those the activists claim are involve in recruitment.

In pictures: Saint-Denis raid Show all 33 1 / 33 In pictures: Saint-Denis raid In pictures: Saint-Denis raid A man is arrested by police officers at the site where a raid happened in the city center of Saint-Denis, near Paris In pictures: Saint-Denis raid Hooded police officers detain a man in Saint-Denis, near Paris In pictures: Saint-Denis raid Hooded police officers detain a man in Saint-Denis, near Paris In pictures: Saint-Denis raid Police officers detain a man on the ground inside a shopping mall in Saint-Denis In pictures: Saint-Denis raid Police officers arrest a man in Saint-Denis, a northern suburb of Paris In pictures: Saint-Denis raid French police officers storm a church after a raid in Paris suburb Saint-Denis In pictures: Saint-Denis raid Police officers at work at the site where a raid happened in the city center of Saint-Denis In pictures: Saint-Denis raid Some people are being transferred to a local hospital near the site of this morning police raid in Saint-Denis In pictures: Saint-Denis raid Residents are evacuated in Saint-Denis In pictures: Saint-Denis raid Inhabitants are evacuated from a security perimeter set in the northern Paris suburb of Saint-Denis city center In pictures: Saint-Denis raid Families are evacuated by police members at the site were a police raid happened in the city center of Saint-Denis In pictures: Saint-Denis raid Rescue teams take care of an injured police officer at the site where a police raid happened in the city center of Saint-Denis In pictures: Saint-Denis raid Members of special French RAID forces with a police dog and French riot police (CRS) secure the area during an operation in Saint-Denis In pictures: Saint-Denis raid Police forces operate in Saint-Denis, a northern suburb of Paris In pictures: Saint-Denis raid French riot police (CRS), soldiers, firefighters and health workers stand at the scene in Saint-Denis In pictures: Saint-Denis raid French riot police (CRS) secure the area as shots are exchanged in Saint-Denis Reuters In pictures: Saint-Denis raid Rescue teams and police gather at the site where raid happened in the city center of Saint-Denis In pictures: Saint-Denis raid Soldiers operate in Saint-Denis, a northern suburb of Paris AP In pictures: Saint-Denis raid Police officers take up positions in Saint-Denis, a northern suburb of Paris AP In pictures: Saint-Denis raid Police and Ambulance vans are parked in Saint-Denis, a northern suburb of Paris AP In pictures: Saint-Denis raid A resident is being searched by police officers in Paris suburb Saint-Denis AP In pictures: Saint-Denis raid Members of French police special forces in the northern Paris suburb of Saint-Denis city center, as French Police special forces raid an appartment, hunting those behind the attacks that claimed 129 lives in the French capital In pictures: Saint-Denis raid Anti-terrorist police raid apartment in Saint Denis, Paris. Reports suggest the target of the police siege in Saint-Denis is Abdelhamid Abaaoud, thought to be the mastermind behind the Paris attacks. Three suspected terrorists have barricaded themselves in an apartment gunfire has been exchanged between the men and dozens of armed police Rex In pictures: Saint-Denis raid French special police forces secure the area as shots are exchanged in Saint-Denis Reuters In pictures: Saint-Denis raid French police evacuate residents in Saint-Denis Reuters In pictures: Saint-Denis raid Police officers take up positions in Saint-Denis, a northern suburb of Paris AP In pictures: Saint-Denis raid Police forces prepare in Saint-Denis, a northern suburb of Paris AP In pictures: Saint-Denis raid French spolice stop and search a local resident as shots are exchanged in Saint-Denis In pictures: Saint-Denis raid French police members participate in an raid in the city center of Saint-Denis EPA In pictures: Saint-Denis raid French special police forces secure the area as shots are exchanged in Saint-Denis Reuters In pictures: Saint-Denis raid Firemen wait for the develop of the operation in the city center of Saint-Denis EPA In pictures: Saint-Denis raid French police secure the area as shots are exchanged in Saint-Denis Reuters In pictures: Saint-Denis raid French special police forces secure the area as shots are exchanged in Saint-Denis Reuters

Anonymous began its campaign against Isis in earnest after the killings at Charlie Hebdo in January. That work included launching attacks on extremist websites and finding extremist accounts on Twitter so that the social network could take them down.

Anonymous declares war on Islamic State after Paris attacks

It has continued that work this time around. Its attacks on websites seem to use a distributed denial of service, a technique that overloads a site's servers until they go offline. The Twitter accounts are taken down by the network itself, in response to requests the activists make once they are found.