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Germany was hit by the latest terrorist attack to strike Europe on Monday evening when a truck mowed down 12 people and injured 48.

Witnesses described a "big boom" with "blood and bodies everywhere" as chaos took hold.

But a Pakistani man detained near the scene of the massacre is no longer believed to be linked to the atrocity – meaning the attacker is still out there and a huge manhunt continues.

ISIS have since claimed responsibility for the bloodshed – as Europe braces itself for a second wave of attacks until the culprit is found.

(Image: REUTERS)

After a more thorough search of the truck, police claimed to be looking for a Tunisian man known as Anis A.

The suspect arrested yesterday was released without charge due to insufficient evidence.

A police official told local paper Die Welt: "We have the wrong man.

"We have a new situation – the real attacker is still at large and can carry out new harm."

And the police reporter with Die Welt who first reported doubts that they had the perpetrator, said investigators were "absolutely at a loss" over who was behind the attack.

“The police have no idea who they’re looking for,” Michael Behrendt said.

“They have no weapon, no DNA traces.

“Until they have any concrete information, it’s still completely unclear what they’re dealing with,” he said.

CCTV footage filmed around Breidscheid Platz is being analysed in the hope it would come up with information.

Klaus Bouillon, chairman of the interior ministerial conference, announced that Germany is now in a “state of war”.

He added that authorities will do whatever it takes to keep its people safe, including the use of “long-range weapons, short weapons, machine guns.”

The lorry was stolen from a building site in Berlin on Monday.

A Polish man was found dead from a gunshot in the lorry, a German foreign minister confirmed.

Police are looking into claims the vehicle, which was loaded with 25 tons of steel from Italy, was hijacked.