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The driver of the truck – which ploughed into the market killing 12 and injuring dozens – is from Pakistan, according to German media.

German authorities have refused to confirm the nationality of the man.

The suspect was arrested 2km away and is being interviewed by police.

According to reports the driver entered Germany on New Year's Ev Eve last year and registered in Berlin with authorities in February this year.

The HGV – which mounted the curb apparently driving into the gathered crowd – was registered in Poland.

But one theory at the moment is that the lorry was hijacked.

Police say they are now treating it as a "presumed terror attack".

(Image: DAILY STAR)

Signs so far point towards a terror attack.

Police say the driver drove it into the revellers "intentionally".

The White House said it “appears to have been a terrorist attack”.

Donald Trump has blamed ISIS – accusing the group of "slaughtering Christians in a jihad".

A group a terror suspects arrested in France last week were reportedly plotting an attack on a Christmas market on the Champs Elysees, in Paris.

The US warned ISIS terrorists were planning an attack on Christmas markets in Europe last month.

An American of Yemeni origin is accused of discussing launching a truck attack on Times Square, in New York.

A passenger was found dead in the truck.

Polish media is reporting that he was from Poland.

It is possible the suspect hijacked the lorry with the original driver inside.

Some reports suggest Twitter accounts linked to ISIS are claiming responsibility for the attack.

The truck travelled as far as 80 metres through the stalls in the Christmas market, coming to rest in Budapest Street.

The suspect was arrested in a zoo nearby – according to German media.

He reportedly fled from police.

(Image: REUTERS)

The lorry, which was loaded with steel beams, was Polish-owned.

Company owner Ariel Zurawski said the driver was his cousin and had been due to stop in Berlin for a break.

He said he had not heard from the driver since around noon on Monday.

Berlin police have said they suspect the truck was stolen from a construction site in Poland.

Investigations into what happened to the truck – and its driver – are ongoing.