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.

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.

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.

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