'We will strike back': Anonymous issues threat to ISIS after latest terror attacks in Belgium that 'killed innocent civilians' and 'attacked our freedom' 

ISIS is set to come under renewed attack from hackers following its terrorist atrocities in Brussels yesterday.

Hacking group Anonymous have issued a declaration that it will up its cyber attacks on the terror group in the wake of the bombings in Belgium.

The group unveiled its so-called 'Op Brussels' today in which it vowed to continue 'hacking their websites, shutting down their Twitter accounts and stealing their Bitcoins'.

Attacking: Hacker collective Anonymous have stepped up their cyber war on ISIS in the wake of Tuesday's terrorist attacks, in a new operation named #OpBrussels

Attacking: Hacker collective Anonymous have stepped up their cyber war on ISIS in the wake of Tuesday's terrorist attacks, in a new operation named #OpBrussels

In the video released online, a member of the group appears in Guy Fawkes/V for Vendetta mask and vows to continue the online campaign against the Syria-based terrorists.

The speaker states: 'We have silenced thousands of Twitter accounts directly linked to ISIS. We severely punish Daesh on the dark net, hacked their electronic portfolio and stolen money from the terrorists.'

'We have laid siege to your propaganda websites, tested them with our cyber attacks, however we will not rest as long as terrorists continue their actions around the world.

'We will strike back against them... we will defend the rights of freedom and tolerance.'

Anonymous have been fighting ISIS online since before the Paris attacks in November, and today vowed to continue 'hacking their websites, shutting down their Twitter accounts and stealing their Bitcoins'

Anonymous have been fighting ISIS online since before the Paris attacks in November, and today vowed to continue 'hacking their websites, shutting down their Twitter accounts and stealing their Bitcoins'

Anonymous issued a similar treat after the Paris attack last November, vowing to hunt down those responsible online and expose them

But ISIS's online unit, the Islamic Cyber Army, hit back, branding the group 'idiots' and declaring: 'What they gonna hack…all they can do is hacking twitter accounts, emails, etc.'

ISIS militants use a number of encrypted messaging services, email providers, and GPS blockers to communicate under the radar.

The list of apps used by the jihadists was revealed last year after a 34-page ISIS fighter handbook was obtained by independent military research group Combating Terrorism Center (CTC), and published on Scribd by Yahoo.

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