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(Image: EPA/GETTY)

Police and special forces raided four flats and two offices in Berlin and properties in the northern regions of North Rhine-Westphalia and Lower Saxony.

They were carried out to prevent "severely violent attacks," police say.

Two of the properties that were searched were an asylum seeker's home in Hanover and another in Attendorn in the Sauerland region.

As revealed in Daily Star Online, ISIS hate manuals boast about infiltrating Europe and wreaking havoc with terror attacks as part of its apocalyptic vision.

Experts predict Germany is the target of a terrorist attack by ISIS, also known as Daesh, because of its public support for bombing missions against the sick terror group in Iraq and Syria.

But Berlin was the centre of the operation where police swooped on four apartments and two business premises.

(Image: EPA)

"Specifically the raids concern possible plans for an attack in Germany, even more specifically in Berlin," Martin Steltner, a spokesman for Berlin prosecutors, told Reuters TV.

Berlin police spokesman Stefan Redlich said the authorities were investigating four Algerian men. Police detained two men and a woman.

"Our understanding is that the four men accused could have planned to carry out such an attack together," Mr Steltner said.

German media reported that central Berlin landmarks and tourist attractions Checkpoint Charlie and Alexanderplatz were targets.

(Image: AFP) (Image: EXPRESS NEWSPAPERS)

Redlich said the Berlin suspects worked in those two locations and that searches were carried out there.

But he could not confirm that they were the targets.

Redlich and Steltner said police acted on a tip-off but gave no further details.

Security agencies have been monitoring the suspects since January.

Leading ISIS members who were responsible for the Paris attacks that killed 130 people in November, had given the order for an attack in Germany.

Prosecutors declined to comment on the report.