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Anonymous has declared a new cyber war on ISIS following the terror attacks on Belgium.

The message comes just a day after 31 people were killed in explosions as Brussels airport and at Maalbeek metro station.

Wearing their trademark hood and mask, and speaking with a computerised voice the group tells listeners: "Our freedom is once again under attack

"This cannot continue.

"Following the attacks in Paris last November, we have fought daily against terrorism and we have silenced thousands of Twitter accounts directly linked to ISIS.

Follow our live blog for the latest updates on the Brussels terror attacks.

"We severely punish Daesh on the dark net, hacked their electronic portfolio and stolen money from the terrorists."

(Image: Youtube/Anonymous AnonduPeuple)

He adds: "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 keep hacking their websites, shutting down their Twitter accounts and stealing their Bitcoins.

"We defend the rights of freedom and tolerance.

"To the supporters of Daesh, we will track you down, we will find you, we are everywhere and we are more than you can imagine.

"Be afraid."

"When they killed innocent civilians in Belgium, they hit everybody in Europe.

"We have to fight back."

Back in November, following the attacks in Paris, Anonymous declared war on ISIS with a similar stark video.

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He is now asking everyone to join their campaign.

He says: "Everyone can contribute to our efforts and we invite you to fight with us.

"You will find the link with this video, which will indicate how.

"But you don't have to hack them, if you stand up against discrimination in your country, you will harm them much more than by hacking their websites.

"The Islamic State cannot recruit Muslims in Europe if they are accepted and included in the society.

"So we want all of you to stand together against discrimination."

It ends with the message: "We are Anonymous, we are legion, we do not forgive, we do not forget, we are free.

"Expect us."