More than 100 innocent lives were claimed during the night of Nov. 13, Friday, when Islamic State Iraq and Syria (ISIS) unleashed terror in Paris.

Now, Anonymous, loosely-affiliated network of hackers, has declared war on the group, vowing to disrupt their propaganda on social media through cyber attacks.

On Nov. 14, Saturday, Anonymous uploaded a video on YouTube declaring war on ISIS. The video featured a man wearing a Guy Fawkes mask and speaking in French.

According to the man in the video, the group will hunt down ISIS militants who assumed responsibility for the killings in Paris.

On Sunday, the activist hackers have launched their online campaign called Operation Paris or #OPParis, EnGadget reported. This campaign was designed to stop ISIS from reaching out to different people through social media, while France launches airstrikes against the terror group in Syria.

Anonymous already gathered a list of Twitter accounts and websites owned by ISIS, which they will be taking down. According to the collective, they have successfully suspended 5,500 Twitter accounts, BBC reported.

The hacktivists' exact plans remain uncertain, but BBC's Rory Cellan-Jones got the chance to do a telephone interview with one of Anonymous' members, who was behind the Operation Paris Twitter account, to ask about the aims of the campaign.

"Our main goal in this operation is to identify the perpetrators of the Paris terror attacks and all terrorist organisations linked to them, acquire intel to dig deep into the roots of their manpower, disable their propaganda and stop their reach on social media, release their information to the public, and flag down any threat to mankind," the man revealed.

The report further stated that security experts doubt Anonymous' campaigns, but according to the man on the phone, the group will verify any data they've gathered, ensure that they are legitimate and will not share them unless they've done a thorough investigation.

Stopping ISIS' tracks online may prevent security services from figuring out what they're up to, but Anonymous, admitting they cannot attack the terrorists with weapons, believes that interfering with ISIS' propaganda should "weaken their manpower and their presence in the Internet."