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Hacking group Anonymous claims ISIS is plotting a worldwide day of terror today.

In a statement the secretive collective claims terrorists are plotting to carry out as many as eight attacks on Sunday.

France, the United States, Indonesia, Italy and Lebanon have reportedly been targeted according to posts on Twitter alongside the hashtags #22Daesh #OpParis.

Among the events targeted is the WWE wrestling event at the Philips Arena in Atlanta, Georgia, the Express reports.

Hacker group Anonymous have declared war against ISIS after the attacks in Paris last Friday night.

READ MORE: Brussels terror alert: Four people arrested amid "imminent threat" of Paris-style bomb and gun attacks

Posting a video on YouTube, the group said it would use its knowledge to "unite humanity" and warned the terrorists to "expect us".

The group's latest statement comes as Europe remains on a high state of alert amid fears of further attacks.

Belgian special forces arrested four people today as the country remained on the highest terrorism alert possible, Level 4.

(Image: Getty) (Image: reuters)

The arrests were made at around 3pm today in the Place du Grand Sablon, according to local media.

The Belgian army have been drafted on to the streets of Brussels and the city's metro shut down as security chiefs announced there was a "serious and imminent" threat.

(Image: Reuters) (Image: getty)

The capital had been put into lockdown after reports emerged that the city was facing the threat of a bomb and gun attack similar to that seen on the streets of Paris a week ago.

Charles Michel, Belgian Prime Minster, said the decision to raise the alert was "based on quite precise information about the risk of an attack like the one that happened in Paris".

Speaking at a news conference, he said the fear was that "several individuals with arms and explosives could launch an attack ... perhaps even in several places".

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Mr Michel added: "We urge the public not to give in to panic, to stay calm. We have taken the measures that are necessary."

Heavily-armed soldiers are patrolling the streets, trucks drive down the roads and members of the public have been told to avoid public gatherings - such as concerts - while the threat is examined.

Belgium's national Crisis Centre raised its terrorism alert for the Brussels region to Level 4, which indicates a "serious and immediate threat".